Which method of transport is used for peptides in the process of reabsorption?

Correct Answer: C

Rationale: Peptides are reabsorbed via endocytosis PCT engulfs small proteins (e.g., filtered peptides), energy-dependent. Facilitated diffusion suits glucose not peptides. Active transport is Na not engulfing. Passive diffusion lacks mechanism insufficient. Endocytosis distinguishes it, critical for protein recovery, unlike diffusion or pump methods.

Correct Answer: C

Rationale: ADH won't stop diuresis in nephrogenic diabetes insipidus tubules resist (e.g., receptor defect). Lack of ADH responds diabetes insipidus. Excess water dilutes ADH corrects. Combined is treatable ADH works. Resistance distinguishes it, critical for ADH failure, unlike responsive causes.

Correct Answer: B

Rationale: Low [H₂CO₃] is difficult to measure rapidly dissociates to CO₂/H₂O (e.g., lab challenge). Easy estimation misstates requires CO₂ proxy. Ineffective ignores Henderson-Hasselbalch false. Replacement isn't needed CO₂ suffices. Measurement difficulty distinguishes it, critical for pH calculation, unlike estimation or equation errors.

Correct Answer: A

Rationale: The urinary system excretes waste (e.g., urea) and balances fluids/electrolytes not enzyme production (digestive), oxygen transport (respiratory), or temperature (skin). This defines its primary role, critical for homeostasis, contrasting with unrelated systems.

Correct Answer: B

Rationale: ADH increases water reabsorption in collecting ducts not aldosterone (Na+/K+), insulin (glucose), or oxytocin (labor). This identifies water regulation, key for urine concentration, contrasting with electrolyte or metabolic hormones.