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What occurs during internal respiration?

A.

Carbon dioxide diffuses out of the blood.

B.

Oxygen binds with the hemoglobin.

C.

Carbon dioxide dissociates from the hemoglobin.

D.

Oxygen diffuses out of the blood.

Answer and Explanation

The Correct Answer is D

A. Carbon dioxide diffuses out of the blood: This describes external respiration in the lungs.

B. Oxygen binds with the hemoglobin: This happens in the lungs during external respiration.

C. Carbon dioxide dissociates from the hemoglobin: This occurs during external respiration when carbon dioxide is released into the lungs.

D. Oxygen diffuses out of the blood: Internal respiration refers to the exchange of gases between the blood and tissues, where oxygen diffuses out of the blood into the tissues for cellular use.


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Related Questions

Correct Answer is C, A, D, B

Explanation

  • Deoxygenated blood from the body enters the right atrium, passes through the tricuspid valve into the right ventricle.
  • From the right ventricle, blood moves through the pulmonary valve into the pulmonary arteries and goes to the lungs for oxygenation.
  • Oxygenated blood returns to the left atrium and passes through the bicuspid (mitral) valve into the left ventricle.
  • Finally, the left ventricle pumps oxygenated blood through the aortic valve into the aorta for distribution to the body.

Correct Answer is B

Explanation

A. To increase the effectiveness of drugs and hormones in the blood: Tubular secretion helps in removing drugs and hormones, not increasing their effectiveness.

B. To remove excess quantities of substances from the blood: Tubular secretion is responsible for removing excess ions, waste products, and drugs from the blood and excreting them into the urine.

C. To filter out pathogens from the blood: Filtration primarily occurs at the glomerulus, not tubular secretion, and it does not focus on pathogens.

D. To remove 99% of the water from the blood: This is not the purpose of tubular secretion; water reabsorption primarily happens in the nephron’s other parts.

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