What occurs during internal respiration?
Carbon dioxide diffuses out of the blood.
Oxygen binds with the hemoglobin.
Carbon dioxide dissociates from the hemoglobin.
Oxygen diffuses out of the blood.
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 A
Explanation
A. Cecum: The cecum is the first part of the large intestine, where fluids and salts are absorbed after digestion in the small intestine.
B. Ascending colon: The ascending colon continues the process of absorbing water and salts but starts after the cecum.
C. Rectum: The rectum stores feces and plays little role in fluid and salt absorption.
D. Descending colon: While the descending colon absorbs water, much of the absorption occurs earlier in the large intestine, primarily in the cecum.
Correct Answer is D
Explanation
A. Fully mature and leave the epididymis: The acrosome does not play a role in sperm maturation or their release from the epididymis.
B. Travel through the male reproductive ducts: Movement through the reproductive ducts relies on the sperm's flagellum and muscle contractions, not the acrosome.
C. Develop a full set of chromosomes: Chromosome development occurs during spermatogenesis and is unrelated to the acrosome.
D. Breach and fertilize the ovum: The acrosome contains enzymes that allow the sperm to penetrate the ovum during fertilization. Without an acrosome, the sperm would be unable to breach the egg’s outer layer.
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