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 B
Explanation
A. Lipid absorption: Absorption occurs in the small intestine after fats have been digested into smaller molecules. Bile salts do not absorb lipids directly.
B. Lipid emulsification: Bile salts break large fat globules into smaller droplets in a process called emulsification, which increases the surface area for digestive enzymes like lipase to act.
C. Lipid ingestion: Ingestion refers to eating, not the chemical processing of fats.
D. Lipid digestion: Digestion is primarily performed by lipase, not bile salts. Bile salts prepare fats for digestion.
Correct Answer is A
Explanation
A. Potassium ion concentration in extracellular fluid: High levels of extracellular potassium stimulate aldosterone secretion and enhance potassium secretion into the renal tubules for excretion. This is the most direct and critical factor.
B. Intracellular sodium levels: While sodium levels affect membrane potentials, they do not directly regulate potassium secretion.
C. The pH of the intracellular fluid: pH changes can influence potassium distribution between compartments but are not the main driver of secretion.
D. The potassium ion content in the renal tubule cells: This reflects storage, not the signal for secretion. The extracellular fluid concentration is what regulates the process.
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