Why is pepsin is secreted as a zymogen?
because it saves one step in its synthesis
so it will start digesting intracellular proteins of the chief cells more quickly
so it acts only in the stomach lumen and does not digest intracellular proteins
so it can start digesting dietary proteins more quickly
The Correct Answer is C
A. Because it saves one step in its synthesis: Zymogen secretion is about preventing premature activation, not simplifying synthesis.
B. So it will start digesting intracellular proteins of the chief cells more quickly: This would be harmful-zymogens prevent self-digestion of the cells that produce them.
C. So it acts only in the stomach lumen and does not digest intracellular proteins: Pepsin is secreted as inactive pepsinogen to prevent it from digesting the proteins inside chief cells. It is only activated to pepsin in the acidic environment of the stomach lumen.
D. So it can start digesting dietary proteins more quickly: Speed is not the reason for secreting it as a zymogen-safety is.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Body’s water volume is high: When well-hydrated, ADH secretion is low, resulting in dilute (hypotonic) urine as the kidneys excrete excess water.
B. Body’s pH is low: This would affect acid-base balance, not urine tonicity directly.
C. Output of antidiuretic hormone is high: High ADH increases water reabsorption, leading to concentrated (hypertonic) urine.
D. Output of natriuretic peptides is high: These promote Na⁺ and water loss, but hypotonic urine isn't guaranteed.
E. Person is lost and deprived of drinking water: In dehydration, ADH increases, and urine becomes concentrated, not hypotonic.
Correct Answer is C
Explanation
A. Arcuate a. → interlobar a. → afferent arteriole → cortical radiate (interlobular) a.: This is an incorrect sequence-interlobar arteries come before arcuate arteries.
B. Interlobar a. → cortical radiate (interlobular) a. → segmental a. → arcuate a.: Segmental arteries are more proximal, immediately after the renal artery.
C. Segmental a. → interlobar a. → arcuate a. → cortical radiate (interlobular) a.: This is the correct anatomical order of arterial blood flow: Renal a. → Segmental a. → Interlobar a. → Arcuate a. → Cortical radiate (interlobular) a. → Afferent arteriole
D. Afferent arteriole → cortical radiate (interlobular) a. → arcuate a. → interlobar a.: This is a reversed and incorrect sequence.
E. Segmental a. → arcuate a. → interlobar a. → cortical radiate (interlobular) a.: Arcuate arteries arise after interlobar arteries, not before.
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