BIOLOGY COLLEGE

Gaseous exchange is best described as?

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Answer 1

Answer:

Answer:

The exchange of oxygen and carbon dioxide between the alveoli and bloodstream (via passive diffusion)

Explanation:

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Answer 2

Answer:

Answer: The exchange of oxygen and carbon dioxide between the alveoli and bloodstream

Explanation:

I hope this helps

Related Questions

Viruses express tissue tropism and host specificity. In particular, the avian influenza strain H5N1 has rare incidences in humans due to the reduced distribution of alpha-2,3 sialic acids in the lower respiratory tract. As a consequence, when the H5N1 strain does infect a human, the disease is very severe due to the risk of pneumonia. In contrast, human influenza strains (H1N1, among others) attach to alpha-2,6 sialic acids, which are readily expressed in the upper and lower respiratory tract. Which of the following would not be true if a mutation were to allow the H5N1 strain to attach to alpha-2,6 sialic acids?Choose one:A. The avian influenza strain could be transmitted easily from human to human.B. An epidemic would likely ensue due to the lack of immunity to the new avian influenza strain.C. The avian influenza strain could be transmitted directly from birds to humans.D. The avian influenza strain would only infect the lower respiratory tract of humans.Hint: Alpha-2,6 sialic acid is expressed throughout the human respiratory tract.
A researcher is studying gene expression in different types of cells. For a gene of interest, he notes its expression no longer appears to be regulated—it occurs in all cells, rather than in just a few cell types. The gene’s corresponding transcript and protein, however, appear normal. This may be the result of a mutation in which of the following regions associated with the gene? (5 POINTS)SilencerIntronExonPromoter9What role does the MutL protein play in DNA repair? (5 POINTS)It performs a proofreading function, similar to DNA polymerase, and removes incorrect bases from the template DNA strand.It recognizes and binds to a pair of "mismatched" nucleotides, preventing their translation.It recognizes the newly-synthesized DNA strand (e.g., by detecting nicks), ensuring only it—and not the template strand—is repaired.It helps to link together regions of DNA, after an error has been removed via exonuclease.10If a mutation occurs that affects the large subunit of a ribosome, rendering it inactive, how would this affect translation? (5 POINTS)The small subunit of the ribosome would fail to associate with a mRNA.Methionine tRNA would not recognize the start codon of a mRNA.New amino acids would not be added after the initial methionine, so translation would be effectively inhibited.Arginine tRNA, rather than methionine tRNA, would associate with a mRNA’s stop codon.
Lipids in a bilayer can diffuse laterally at a relatively fast rate, but \"flip-flop\" from one leaflet to the other very slowly without catalysis. Three protein families –flippases (or flipases), floppases, and scramblases – catalyze the movement of lipids across the bilayer. Sort each of the phrases as describing flippases, floppases, or scramblases. Choose the best, most-specific enzyme name. Note: If you answer any part of this question incorrectly, a single red X will appear indicating that one or more phrases are sorted incorrectly.Not ATP-dependent, Activation may result in increased membrane lipid symmetry, ABC transporter, translocate lipids from outer (extracellular) leaflet to inner (cytosolic) leaflet, translocate phosphatidylserine, preventing apoptosis and engulfment by macrophages, move phospholipids from inner (cytoplasmic) leaflet to outer (extracellular) leaflet, move phospolipids across the lipid bilayer down the concentration gradient
3. During which stage of the cell cycle would a cell contain the least total amount of DNA?
Describe two different methods that can be usedto assist in solving crimes and missing personcases. Explain the benefits of each.

Explain why hormones are able to travel through the body but only affect certain cells.

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Answer:

Hormones are able to travel the body but only affect certain cells because only those target cells have receptors for that particular hormone. Some hormones bind to receptors on the surface of target cells. Others enter the cells and bind to receptors in the cytoplasm or nucleus.

Identify the low-pressure areas on the map.

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Answer: the low-pressure areas on the map are the purple triangle and half circles

Explanation:

Which of the following describes a negative feedback loop?A. When the heart rate is too high, the body releases hormones that continually increase the heart rate higher.
B. When a pregnant woman is in labor, the body releases hormones that increase the intensity of contractions, which then increases the secretion of the same hormones.
C. When blood sugar concentration is above normal, the endocrine system releases hormones that lower the blood sugar concentration until it reaches a normal level, and the release of the hormones slows.
D. When a person is jogging, the body releases hormones that continually decrease the rate of oxygen supply to the legs.

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ANSWER is A

When blood sugar concentration is too low, the endocrine system secretes hormones that increase blood sugar concentration to a normal level.

Explanation:

i believe the answer is b

Which type of malnutrition is characterized by a swollen belly due to the accumulation of fluid in the abdomen?

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The answer is kwashiorkor. Kwashiorkor, also known as “edematous malnutrition” because of its relationship with edema is a nutritional disorder most often seen in regions experiencing famine. It is a form of malnutrition caused by an absence of protein in the diet.

Approximately 99% of the microbes in the intestines are obligate anaerobes. We have plenty of blood vessels that can bring oxygen to the tissues of the intestines. Why would there be obligate anaerobes within these areas? A. The bacteria in the intestines are protected from exposure to the oxygen in the tissues by the lining of the intestines. B. The bacteria consume all the oxygen in the tissue areas brought by the blood vessels, creating an anaerobic environment. C. While the blood vessels supply oxygen to the tissues of the intestines, the inner area where the bacteria reside is NOT supplied with blood/oxygen. Since it's deep within our bodies, there's no chance for oxygen to get into these inner areas of the intestinal tube, creating a highly anaerobic environment. D. The aerobic microbes are outcompeted for nutrients in these areas by the anaerobic microbes.

Answers

Answer:

The correct answer is option C.

Explanation:

The human gastrointestinal microbiota or the gut microbiota or the gut flora refers to the microbes, which thrive in the digestive tracts of humans. The human gastrointestinal tract comprises the gathering of all the genomes of gut microbiota. It is the niche where the human microbiota is found.

The microbial composition of the gut microbiota differs across the digestive tract. In the small intestine and stomach, very small species of bacteria are found, while the colon comprises the densely populated microbial ecosystem. Of these over 99 percent of the bacteria found in the gut are anaerobes, as the space within the intestines is highly anaerobic.

These microbes are confined deep within the body where oxygen cannot reach as it is not supplied with the help of blood vessels. Thus, a highly anaerobic environment is witnessed deep within the intestinal regions.

Nicotine, a substance found in cigarettes, causes blood vessels to constrict. What effect might prolonged smoking have on the body? A. Decreased heart rate B.Decreased heart strength C.High blood pressure D. High blood volume

Answers

C. High Blood Pressure is the answer

The effect of prolonged smoking is c - high blood pressure, by constricting the blood vessels.