A normal or narrow QRS complex indicates that the impulse was not formed in the ventricles and is termed supraventricular tachycardia.
Narrow (normal) QRS complexes indicate that the ventricles are depolarized normally; this can only be the case if the impulse (which depolarizes the ventricles) passes through the bundle of His, and hence it originates in the atria. In other words, tachycardias with narrow QRS complexes originate in the atria.
A narrow QRS complex (<120 ms) reflects rapid activation of the ventricles via the normal bundle of His-Purkinje system, which in turn suggests that the arrhythmia originates above or within the His bundle so supraventricular tachycardia occurs. Although such type of tachycardia often occurs in patients with a normal heart and rarely represents life threatening conditions.
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What are the 5 causes of natural selection?
Natural selection is a simple mechanism that causes populations of living things to change over time. It causes are variation, Inheritance, Selection, Time and Adaptation.
Natural selection results in the transmission of advantageous genetic variants through reproduction. As a result, a new generation of organisms emerges that has a higher chance of surviving and reproducing.
Variation. Organisms (within populations) exhibit individual variation in appearance and behavior. Inheritance. Some traits are consistently passed on from parent to offspring. High rate of population growth.Differential survival and reproductionTo learn more about reproduction please visit here:
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"BB" - this is described as what configuration?
BB is a dominant purebred condition in which only one character or trait is expressed, such as if it is for black, then only black will be expressed as there are two alleles present and both are similar.
What is the significance of the purebred traits?The term "purebred trait" refers to the presence of two dominant or two recessive alleles in genotypes such as BB and TT, and the parents with purebred traits inherit the gametes with a single type gene and no chance of variation is here.
Hence, BB is a dominant purebred condition in which only one character or trait is expressed, such as if it is for black, then only black will be expressed as there are two alleles present and both are similar.
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What organelle helps the cell maintain homeostasis?
Organelle helps the cell maintain homeostasis are Cell membrane, Mitochondria, Autophagosomes, Lysosomes
The cell's outer layer, or cell membrane, acts as a largely permeable barrier to the extracellular environment. The cell membrane is a semi-permeable barrier that only permits certain chemicals to enter the cell.
Mitochondria are the powerhouse of the cell, but they also actively contribute to homeostasis. The cytoplasmic levels of nutrients are detected by mitochondria, which are also involved in the breakdown of lipids.
By destroying and eliminating hazardous substances including outdated or damaged organelles, pathogens, protein aggregates, and storing nutrients like lipid droplets, autophagosomes contribute to homeostasis. These dangerous chemicals are delivered to lysosomes by autophagosomes. The primary recyclers within a cell are lysosomes. They export their remains outside the cell after digesting the deadly chemicals.
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What happens if there is a mutation in the active site?
Because it has no effect on the active site, the gene mutation is not an issue.
The creation of a distinct or defective protein may result from mutations. The specific substrate might not fit into the substrate binding site, for instance, if the protein is a significant enzyme. It may become weaker if it is a structural protein like collagen.
The majority of DNA mutations, meanwhile, do not change a protein. One explanation is the possibility of several triplets encoding the same amino acid. Other mutations may simply make a little alteration to the protein, maintaining its appearance or functionality.
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What implications could this have for this species of slug from an evolutionary standpoint? What potential advantages or disadvantages might this mutation have?
Positive mutations are essential for evolution to occur. They raise a living thing's chances of surviving or procreating. Deadly mutations can give rise to cancer or genetic diseases.
Are mutations typically detrimental?While most mutations are beneficial, some can also be dangerous. A dangerous mutation might cause a genetic illness or a cancerous condition. Chromosome-level mutations are still another type. Chromosomes, which are little, threadlike organelles present in the cell nucleus, carry genes.
Why do mutations cause issues?A variation can make a protein malfunction or not be created at all by altering the gene's instructions for producing it. A variation can impair normal development or result in a disease when it changes a protein that is essential to the organism.
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The membrane-bound compartment indicated by structure D contains which of the following?
O ribosomes O oxidases and catalases O hydrolytic enzymes O nucleic acids
The membrane-bound compartment indicated by structure D contains is d)nucleic acids.So,correct option is d.
Nucleic acids are biopolymers, macromolecules, vital for all known types of life.[1] They are made out of nucleotides, which are the monomers made of three parts: a 5-carbon sugar, a phosphate bunch and a nitrogenous base. The two fundamental classes of nucleic acids are deoxyribonucleic corrosive (DNA) and ribonucleic corrosive (RNA). On the off chance that the sugar is ribose, the polymer is RNA; assuming the sugar is the ribose subordinate deoxyribose, the polymer is DNA.
Nucleic acids are regularly happening engineered combinations that go about as the fundamental information passing on particles in cells and make up the genetic material. Nucleic acids are found in flood in each and every living thing, where they make, encode, and subsequently store information of every single dwelling cell of every single life-structure in the world.
Hence, correct option is d.
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(Complete question) is:
The membrane-bound compartment indicated by structure D contains which of the following?
a)ribosomes
b)oxidases and catalases
c)hydrolytic enzymes
d)nucleic acids
If an organism has 50 chromosomes, how many chromosomes will the gametes have after undergoing meiosis
If an organism has a diploid number of 50, and one of its cells undergoes meiosis, then the number of daughter cells produced by this cell is four and each contains 25 chromosomes.
Diploid may be defined as a condition that determines the existence of two complete sets of chromosomes in an organism's cells, with each parent contributing a chromosome to each pair.
On contrary, haploid cells generally contain only a single set of chromosomes. These types of cells are formed due to the process of meiosis, while diploid cells are formed by the activity of mitosis.
According to the question, if a diploid number of an organism = 50.
This means that 2n = 50,
n = 25.
As we all know that when a cell undergoes meiosis, it will definitely have half the amount of genetic content in its daughter cells.
Therefore, if an organism has a diploid number of 50, and one of its cells undergoes meiosis, then the number of daughter cells produced by this cell is four and each contains 25 chromosomes.
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How do clams protect themselves from predators?
A student hypothesized that robins prefer large birdhouses to small ones. He build four birdhouses of different sizes to test his hypothesis. What was the independent variable in the students study?
Option a is Correct. According to a student's theory, robins choose large birdhouses over little ones. He constructed four birdhouses of various sizes to test his theory, and the student's study's independent variable (cause) is the size of the birdhouses.
The benefits of including a birdhouse in your garden or yard are endless. Of course, they're beautiful to look at, but they also have a ton of additional features and advantages. one of our preferred ones? Birdhouses give persons who have been uprooted by fast deforestation and urbanization a safe place to live.
Birdhouses help with insect control, weed control, flower pollination, and the upkeep of native flora since they are so enticing to neighborhood birds. In addition, painted birdhouses give outdoor areas personality and depth.
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Correct Question:
A student hypothesized that robins prefer large birdhouses to small ones. He built four birdhouses of different sizes to test his hypothesis. What is the independent variable (cause) in the student's study?
a. the size of the birdhouses
b. the location of the birdhouses
c. the number of birds in the house
d. the season of the year
How did Kai acquire NF1? How likely is it that the Rossis will have another child with NF1?
Neurofibromatosis type 1, commonly known as NF1, is a genetic disorder that affects approximately 1 in 3,000 people worldwide. It is an autosomal dominant disorder, meaning that a person only needs to inherit one copy of the NF1 gene from a parent in order to develop the disorder.
Kai Rossi, a young boy from the United States, was diagnosed with NF1 in 2019. His parents, John and Sarah Rossi, were both carriers of the NF1 gene, although neither of them have the disorder. This means that each time they had a child, that child had a 50% chance of inheriting the NF1 gene from either of them. As luck would have it, Kai inherited the NF1 gene from his parents and developed the disorder.
The likelihood of the Rossis having another child with NF1 depends on whether or not they are still carriers of the gene. If they are, then the chance of their next child inheriting the NF1 gene is still 50%. However, if they have since had genetic testing and found out that they are no longer carriers, then the chance of their next child developing NF1 is significantly lower.
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According to the primitive earth model which one of the following compounds was not present in the beginning.
A.NH3
B.H2S
C.CO2
D.O2
The Correct answer is Option D.Oxygen
According to Oparin, oxygen was not present in the primitive atmosphere of the Earth.
What is Oxygen?The chemical element with the atomic number 8 and symbol O is called oxygen. It belongs to the periodic table's chalcogen group, is a very reactive nonmetal, and an oxidising agent that easily produces oxides with most elements as well as other compounds. After hydrogen and helium, oxygen is the third most plentiful element in the universe and the most abundant element on Earth. Two atoms of the element combine to generate dioxygen, an odourless and colourless diatomic gas with the formula O 2 at standard pressure and temperature.
According to researchers at MIT, the Great Oxygenation Event (GOE), which is thought to have started as early as 2.33 billion years ago, was the beginning of oxygen's ongoing presence in the atmosphere.
Oxygen in Primitive EarthLouis Pasteur wrote about his research in 1864, demonstrating that microbial life could not have developed spontaneously in the absence of preceding life. This work is regarded as a milestone in modern science as it resolved a long-running debate regarding spontaneous generation.
The concept of spontaneous genesis holds that live things could appear miraculously from inanimate matter.
But Pasteur's findings presented evolutionary biologists with a fresh conundrum: if life could only develop from life, how did living things first originate on the planet?
The solution was presented in the 1920s by A.I. Oparin of Russia and J.B.S. Haldane of England, who independently made compelling cases that the origin of life could be explained by a lengthy and gradual process of chemical evolution rather than by the rapid spontaneous generation of complete organisms in a matter of weeks.
Elements primitive earthAn atmosphere developed when Earth cooled, primarily from gases released by volcanoes. It contained methane, hydrogen sulphide, and ten to 200 times as much carbon dioxide as the atmosphere we are surrounded by today. The Earth's surface began to cool and solidify after roughly 500 million years, allowing water to accumulate there.
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If a classification, such that used to identify insects or rocks, is used in a scientific context, it is most often called a(n) ________
Taxonomy is a classification, such that used to identify insects or rocks, is used in a scientific context .
Studying living things including animals, plants, microorganisms, and people in order to categorise them and increase our understanding of them is known as taxonomy. For instance, although from some views humans and whales are separate animals, both are classified as mammals and share a common ancestor.
Taxonomy is the approach and guiding principles of systematic botany and zoology. It organises different plant and animal species into hierarchies of superior and inferior groupings. In the science of taxonomy, all living things, including plants, are named, described, and categorised. Classification is based on variances in behaviour, genetic makeup, and biochemistry. The steps of taxonomy are characterization, identification, and categorization.
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What statement best describes why the process of meiosis is important to Mendel's law of independent assortment of traits on different chromosomes?
The correct answer (B) In a "fair meiosis", there is an equal probability of each allele going to the gametes.
Independent Assortment Experiment by MendelIn plants that were true-breeding for two characteristics, Mendel conducted dihybrid crosses. For instance, a plant with round seeds and the color of yellow seeds crossed pollinated with a plant with wrinkled seeds and the color of green seeds.
Round seed shape (RR) and yellow seed color (YY) characteristics are prevalent in this hybrid. Recessive traits include wrinkled seed shape (rr) and green seed color (yy).
The kids that resulted (or F1 generation) were all heterozygous for yellow seeds and spherical seed morphology (RrYy). This indicates that in the F1 generation, the dominant features of spherical seed shape and yellow color totally concealed the recessive traits.
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Full Question: What statement best describes why the process of meiosis is important to Mendel's law of independent assortment of traits on different chromosomes?
Meiosis provides a way for alleles to maintain the associations they had in the parental generation.
In a "fair meiosis", there is an equal probability of each allele going to the gametes.
In meiosis, the segregation of one pair of homologous chromosomes affects the segregation patterns of other pairs.
Homologous pairs of chromosomes line up at the metaphase plate in meiosis.
In meiosis, how each pair of homologous chromosomes segregates is unaffected by what other pairs do.
What are the two factors responsible for genetic variation in animals?
Multiple factors can cause genetic variation within a species. Genetic diversity can come from various sources, one of which being mutations, or alterations in the DNA's gene sequences.
Gene flow, or the transfer of genes between several groups of organisms, is another source.
Genetic variation refers to the alteration in gene and gene frequencies. The causes of genetic variation in populations are as follows. Gene mutations, also known as point mutations, are modifications to a gene's chemical structure.
Genetic variety is the term used to describe variations in a population's genetic make-up. 2 Genetic diversity is required for natural selection to occur. 3 Mutations, gene flow, and sexual reproduction are three main sources of variety. 4 Genetic variety originates from DNA mutations that change which modifies the genes of people within a group.
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a cross between ss and Ss will generate _____ % normal hemoglobin, _____% sickle cell trait, and _____% sickle cell anemia.
A cross between ss and Ss will generate 0 % normal hemoglobin, 50 % sickle cell trait, and 50 % sickle cell anemia.
People with sickle cell trait deliver handiest one replica of the altered hemoglobin gene and seldom have any medical signs and symptoms associated with the sickness. In contrast, humans with sickle cell sickness deliver copies of the altered hemoglobin gene. Hemoglobin S trait, additionally cell as sickle cell trait, approach that your infant has inherited one gene for the same old hemoglobin (A) from one discern and one gene for hemoglobin S from the alternative discern. motive any fitness problems. Your infant will now no longer want any remedy or remedy for S trait.
A cross between ss and Ss will generate 0 % normal hemoglobin, 50 % sickle cell trait, and 50 % sickle cell anemia.
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Using a microscope, you observe an amoeba moving toward a food source. This is an example of
A) reproduction.
B) cellular structure.
C) metabolism.
D) growth.
E) responsiveness.
The act of recognizing changes with one's internal or external environment and responding to any of those changes is known as response time, sometimes known at responsiveness or irritability. It consists of sensing a stimulus and responding to it.
What is meant by "responsiveness"?The ability to respond positively or quickly to anything or anyone: They were praised for their capacity to adapt and meet local needs. She doesn't pay much attention to her surroundings.
Why is being responsive so important? It is what?Being responsive demonstrates your concern for others and your commitment to meeting their needs. This expands your network through creating relationships, cultivating trust, and fostering goodwill. If you're a business competing in a competitive market, responsiveness may enable you to stand out and strengthen your brand.
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What color of the visible light is reflected when the plant leaves appear as green in color Brainly?
The color of the visible light that is reflected when the plant leaves appear as green in color is green. The chlorophyll pigments in the leaves of plants absorb the red and blue parts of the visible light spectrum.
The green part is reflected, making the leaves appear green to our eyes. Chlorophyll is a type of pigment that is found in the chloroplasts of plants. Chlorophyll absorbs red and blue light while reflecting green light. It gives the leaves of a plant their green color. The chlorophyll pigments are responsible for the green color of leaves, which are the primary site of photosynthesis in plants. They Chlorophyll absorb light in the blue and red regions of the spectrum, but reflect light in the green region. That is why leaves appear green to the human eye.
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If you were to set up a PCR reaction (in vitro DNA synthesis) with a DNA template, primers,DNA polymerase, dATP, dGTP, dCTP, dTTP and a small amount of ddATP, what would be the result
After the insertion of any adenine base, DNA synthesis may be interrupted (at random). DNA molecules of many different lengths would be produced.
Deoxyribonucleic acid (DNA) is a polymer made up of two polynucleotide chains that coil around one another to create a double helix. The polymer contains genetic instructions for all known organisms and viruses' genesis, functioning, growth, and reproduction.
Nucleic acids include DNA and ribonucleic acid (RNA). Nucleic acids, together with proteins, lipids, and complex carbohydrates (polysaccharides), are one of the four primary categories of macromolecules required for all known forms of life. Because they are made up of simpler monomeric units called nucleotides, the two DNA strands are known as polynucleotides.
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Which of the following is the best example of a mechanistic understanding of a function?
a. We are self-aware so that we can recognize ourselves and distinguish ourselves from others.
b. The kidneys produce urine so that waste products, such as uric acid, do not build up in the blood.
c. Skeletal muscle cells contract when myosin heads attach to actin filaments and rotate, producing force.
d. Bones are strong so that they can support our body weight and protect delicate organs.
Myosin heads bind to actin and myosin and spin to produce force in the contraction of skeletal muscle cells. an illustration of how a function is understood mechanistically.
And what were the four skeleton types?The body's framework is the skeleton. It helps give us form and serves as the base for other structures to attach to. The 206 bones that make up the skeleton may be divided into four groups: flat, long, short, and irregular.
What makes bone health important?Bones are used by the body for a variety of functions, including as anchoring muscles, protecting organs, and creating structure. While it's important for children and adolescents to have strong, stable bones, there are things adults can do to preserve bone health.
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Tropical savannas in East Africa have herds of ____________________ and ____________________ hoofed animals.
Tropical savannas in East Africa have herds of zebra and wildebeest hoofed animals.
The zebra is a member of the equid family and is one of the most recognizable animals in the world. Its black and white stripes make it easily distinguishable from other animals, and it is found in a variety of ecosystems across Africa. Zebras are very social animals, living in large herds of up to several hundred individuals. They feed on grass and other vegetation, and are mostly active in the early morning and late afternoon.
The wildebeest is also a grazing mammal, but from the bovidae family. It is larger than the zebra and has a distinctive curved horn on its head. Wildebeest are highly social animals, often traveling in large herds of up to several hundred individuals. They are also mainly active during the early morning and late afternoon, and feed on grass and other vegetation.
The relationship between zebra and wildebeest is one of mutual benefit. The zebra’s stripes help camouflage it from predators, while the wildebeest’s curved horns are used to defend itself and the herd. Together, they can also provide better protection against predators by forming a large herd. In addition, the two species of hoofed animals help each other to find food and water, and they even graze in the same areas.
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What are the 5 theories of evolution?
Evolution as such, common descent, gradualism, species diversification, and natural selection are the five hypotheses that Darwin united.
A theory is a rationale for how a natural phenomenon functions that has undergone extensive testing through research and experiments intended to establish the validity of the explanation. In this context, evolution might be considered both reality and a theory. The fact that creatures have altered or evolved over the course of Earth's history is undeniable. Additionally, scientists have looked into the mechanisms that could account for the main patterns of change in biology. Since it provides a comprehensive account of events that have taken place in the natural world, evolution is referred to as a theory.
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Movement of the sole (bottom) of the foot towards the midline/median plane of the body is called what
Answer:
it's called foot inversion
normally the foot can perform inversion upto 30 degrees...I hope this helps
please help ..... its for midterm practice
Answer:
10) The top image is Hydrolysis, because water is used to break the molecule into two. The bottom one is condensation because water is created from the formation on two molecules becoming one
11) Hydrophobic means that the molecule repels water. This is usually from nonpolar materials because water is polar and naturally moves away from things that aren't polar like itself.
Meiosis creates 4 daughter cells. How does the genetic information in these daughter cells compare to one another?
The genetic information of the four daughter cells created by meiosis are distinct or different from one another.
What is meiosis?Meiosis is a cell division of a diploid cell into four haploid cells, which develop to produce gametes.
Meiosis is a type of cell division in sexually reproducing organisms that reduces the number of chromosomes in gametes (the sex cells, or egg and sperm).
Meiosis produces four cells containing half the original amount of genetic information. These cells are our sex cells – sperm in males, eggs in females.
The four daughter cells are genetically distinct from one another because of a process called crossing over that occurs in the Prophase I of the division process.
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What are some of the selection criteria used by agriculturalists for selecting plants and livestock
The selection of plants and livestock by agriculturalists is a critical component of successful farming.
It is important to choose the right plants and animals in order to maximize yields, reduce risk, and ensure sustainability. There are several criteria that agriculturalists use to make their selections.
The first selection criteria is climatic adaptability. This means ensuring that the plants and animals being chosen are suitable for the climate, soil, and other environmental conditions of the farm. It is important to choose varieties that are disease resistant, drought tolerant, and adapted to local conditions. Additionally, plants should be chosen based on their yield potential, harvest season, and marketability.
The second selection criteria is genetic variability. This means selecting plants and animals with a wide range of genetic diversity. This diversity is important for ensuring that the crops and livestock are able to adapt to changing environmental conditions. Additionally, genetic diversity helps to reduce the risk of disease and pest outbreaks.
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Transcriptional regulators bind most frequently at the ______ site of DNA. A) major groove. B) minor groove. C) histone complex. D) primary supercoil.
Answer:Major groove
Explanation:
Transcriptional regulators bind most frequently at the major groove of DNA. The major groove is a wider, more accessible groove on the surface of the DNA helix, while the minor groove is narrower and deeper. Transcriptional regulators, which are proteins that bind to DNA and regulate gene expression, often bind to specific sequences of DNA in the major groove to modulate the transcription of particular genes. A histone complex is a group of proteins that helps package the DNA into a compact structure called chromatin, while the primary supercoil is a twisted, spiral structure that forms when DNA is wrapped around histones.
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What makes mollusks unique?
The presence of file-like rasping tool called a radula makes mollusks unique. This structure helps them to dig algae and other food from rocks or they can even shell of prey.
In general , Mollusks are classified to have soft bodies, and the body is not segmented . Soft body helps to holds the heart, liver, digestive system, and other important organs. Mollusks don't have legs, they have rough tongues with teeth like structure known as radula .
Hence, important distinguishing feature in mollusks is having a hard outer shell. That covers the top of the body and helps to enclose many internal organs. They have distinctive head region, this region have tentacles for sensing and also grasping food.
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Corn seeds with identical genetic information were planted on two adjacent farms. The corn plants on one farm were well fertilized and grew large, while the plants on the other farm were not given fertilizer and did not grow as large. The best explanation for these observations is that
The best explanation for these discernments is that environmental conditions impact quality verbalization.
The vitally immediate reason for biodiversity misfortune is land use change (fundamentally for enormous scope food creation) which drives an expected 30% of biodiversity decline all around the world. Second is overexploitation (overfishing, overhunting, and overharvesting) for things like food, prescriptions, and lumber which cruises all over 20%.
The zygote contains all the data fundamental for the development, improvement, and inevitable multiplication of the organic entity. Human sexual multiplication happens in fundamentally the same as way to other physically replicating creatures.
Corn portions are the products of corn (called maize in numerous nations). Maize is a grain, and the portions are utilized in cooking as a vegetable or a wellspring of starch. The portion involves endosperm, microorganisms, pericarp, and tip cap.
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Which two of the following organisms are tertiary consumers in this food web?
Answer:
Snowy owl and Rough-legged hawk
Explanation:
Hard to tell but I believe I'm correct
During which stage of human immunodeficiency virus (HIV) infection do significant neurologic findings occur?
A. Early disease
B. Midstage disease
C. Late disease
D. Advanced disease
During C. Late disease of the human immunodeficiency virus (HIV) infection, significant neurologic findings occur.
HIV infection progresses through the following stages if not treated:
1. Seroconversion illness Some individuals develop a brief illness shortly after contracting HIV. Seroconversion illness or primary or acute HIV infection are terms for this condition.
2. The HIV asymptomatic stage: Most people feel fine and don't have any symptoms after seroconversion. This stage, also known as the asymptomatic stage, can last for years.
3. Symptomatic HIV: The greater your risk of developing infections that your weakened immune system is unable to combat, the longer you live with HIV without treatment: HIV's direct effects, as well as some cancers.
4. Late-stage HIV: If HIV has a chance to do a lot of damage to your immune system, you might get cancer and other serious infections and opportunistic diseases. These conditions are also referred to as "AIDS-defining."
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