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. Extrinsic controls will reduce blood plasma volume while intrinsic controls will increase blood plasma volumes: This is too simplistic. Both can influence fluid volume, but their primary goals differ.
B. Intrinsic controls raise blood pressure while extrinsic controls lower blood pressure: Intrinsic controls maintain GFR, not blood pressure; extrinsic controls (like RAAS and sympathetic input) raise BP.
C. Extrinsic and intrinsic controls work in nearly opposite ways: They serve different purposes rather than being true opposites.
D. Extrinsic controls have the greatest effect on systemic blood pressure while intrinsic controls have a greater effect on GFR: Intrinsic (renal autoregulation) maintains a constant GFR; extrinsic controls (like sympathetic nervous system and RAAS) maintain systemic blood pressure, especially during stress or blood loss.
Correct Answer is D
Explanation
A. Lysozyme: Lysozyme is present in saliva and has antibacterial properties, breaking down bacterial cell walls.
B. Urea and uric acid: These waste products are found in saliva in small amounts.
C. Electrolytes: Saliva contains electrolytes such as sodium, potassium, and bicarbonate.
D. Protease: Proteases (like pepsin or trypsin) are not present in saliva; they are found in the stomach and small intestine.
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