Which of the following is not a function of gastric hydrochloric acid (HCI)?
Destroy ingested pathogens
Convert Fe3+ to Fe2+
Emulsify lipids
Activate pepsinogen to pepsin
The Correct Answer is C
A. Destroy ingested pathogens: HCl in the stomach helps destroy ingested pathogens, providing a first line of defense against infections. Therefore, this is a correct function of HCl.
B. Convert Fe3+ to Fe2+: HCl aids in the conversion of iron from its ferric (Fe3+) to ferrous (Fe2+) form, which is more easily absorbed in the intestine. Therefore, this is a correct function of HCl.
C. Emulsify lipids: Emulsification of lipids is the function of bile, not hydrochloric acid. HCl does not emulsify lipids. This is the correct answer.
D. Activate pepsinogen to pepsin: HCl activates pepsinogen, converting it to the active enzyme pepsin, which is essential for protein digestion in the stomach. Therefore, this is a correct function of HCl.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Metabolic water; cutaneous transpiration: Metabolic water refers to the water produced during metabolic processes within the body. However, most body water intake comes from drinking fluids, not metabolic water.
B. Drinking; cutaneous transpiration and expired air: While drinking is indeed the main source of water intake, the greatest loss of water from the body is through urine, not cutaneous transpiration and expired air.
C. Drinking; radiation: While drinking is the primary source of water intake, radiation is not a significant way the body loses water.
D. Drinking; urine: Drinking fluids is the main source of water intake, and urine excretion is the primary way the body loses water.
Correct Answer is D
Explanation
A. Penetrate the vagina: The acrosome does not play a role in penetrating the vagina. Its function is specifically related to the sperm's ability to penetrate the ovum, making this option incorrect.
B. Dissolve the stickiness of the semen: While enzymes do play a role in semen liquefaction, this is not the function of the acrosome. The acrosome is primarily involved in the process of fertilization, not semen modification.
C. Dissolve the mucosa of the uterus: The acrosome is not involved in dissolving the mucosa of the uterus. Its function is related to penetrating the barriers surrounding the ovum.
D. Penetrate barriers surrounding the ovum: The acrosome contains enzymes that break down the outer layers of the ovum (such as the zona pellucida), allowing the sperm to penetrate and fertilize the egg. This is the correct answer.
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