Which of the following is correct regarding high GFR?

Correct Answer: B

Rationale: High GFR threatens dehydration/electrolyte depletion tubules can't reabsorb all (e.g., overwhelm Tmax), losing essentials. Waste reabsorption occurs if too low not high. Sluggish flow is low GFR opposite. No effect ignores physiology false. Depletion risk distinguishes it, critical for GFR regulation, unlike waste or flow errors.

Correct Answer: D

Rationale: The distal convoluted tubule has higher secretion e.g., H , K (fine-tuning) vs. proximal's organic focus (e.g., creatinine). Proximal secretes reabsorption dominates. Thin ascending/descending focus on concentration not secretion. Distal's secretion role distinguishes it, key to ion regulation, unlike proximal or loop priorities.

Correct Answer: B

Rationale: Sympathetic constriction of afferent/efferent arterioles lowers GFR less filtration, more Na reaches macula densa (e.g., reduced reabsorption upstream). GFR increase is opposite vasodilation. More Na in PCT reabsorption needs higher flow false. Filtered Na drops low GFR. Macula densa delivery distinguishes it, key to feedback, unlike GFR or reabsorption errors.

Correct Answer: B

Rationale: Moistening mouth/throat mucosa inhibits thirst signals hydration (e.g., sensory feedback). Stomach/intestinal stretch activates opposite. Both miscombine stretch stimulates. None ignores mucosa false. Mucosal relief distinguishes it, key to thirst cessation, unlike stretch or null options.

Correct Answer: A

Rationale: Rising [H ] lowers pH acidosis (e.g., pH = -log[H ]). pH increase is alkalosis opposite. Increased pH with acidosis contradicts false. Fallen pH with alkalosis reverses incorrect. Acidosis link distinguishes it, key to pH definition, unlike reversed or mixed errors.