The single most important factor influencing potassium ion secretion is
potassium ion concentration in extracellular fluid
intracellular sodium levels
the pH of the intracellular fluid
the potassium ion content in the renal tubule cells
The Correct Answer is A
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Store fat-soluble vitamins: Hepatocytes store vitamins A, D, E, and K.
B. Detoxify toxic chemicals: Hepatocytes metabolize and detoxify substances like drugs and alcohol.
C. Process nutrients: They metabolize carbohydrates, lipids, and proteins, modifying absorbed nutrients.
D. Produce digestive enzymes: Hepatocytes do not produce digestive enzymes; that is the role of the pancreas and other gastrointestinal organs.
Correct Answer is D
Explanation
A. Cement, root canal, enamel: Cement covers the root, not the outermost crown, and enamel is actually the most superficial layer of the crown, not root canal.
B. Enamel, root canal, dentin: Dentin lies between enamel and the pulp/root canal, so this order is incorrect.
C. Dentin, enamel, cement: Enamel is above dentin; cement is part of the root, not the crown.
D. Enamel, dentin, pulp: Enamel is the outermost protective layer, dentin is beneath it, and pulp is the innermost part containing nerves and blood vessels.
E. Crown, enamel, dentin: The crown is a region, not a tissue. The question asked for tissue layers, not anatomical regions.
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