This is the functional unit of the kidney

Correct Answer: C

Rationale: Nephrons filter/form urine, not hilum (entry), neurons (nerve), or medulla (region). This defines functional unit, key for renal physiology, contrasting with structural terms.

Correct Answer: A

Rationale: Juxtamedullary nephrons' long loops extend into medulla, not cortex, pyramid (part), or all. This locates concentration site, critical for osmolarity, contrasting with cortical nephrons.

Correct Answer: A

Rationale: Peritubular capillaries absorb from tubule cells (all segments), not just collecting duct, PCT, or DCT. This generalizes reabsorption, critical for solute return, contrasting with specific segments.

Correct Answer: D

Rationale: Prostate (reproductive) isn't urinary, unlike urethra, ureter, bladder. This excludes accessory organs, key for system scope, contrasting with urinary structures.

Correct Answer: C

Rationale: Micturition reflex centers in sacral cord (S2-S4), not kidney, cerebrum, or bladder. This locates reflex control, key for voiding, contrasting with higher/organ sites.