Renin secreting cells are located in:

Correct Answer: B

Rationale: Juxtaglomerular cells in afferent arterioles secrete renin not macula densa (senses Na+), efferent arterioles, or lacis cells (support). This pinpoints renin source, critical for RAAS, contrasting with other JGA parts.

Correct Answer: D

Rationale: Medullipin I isn't from peritubular endothelium (medullary interstitial cells) other associations (PCT/brush, bladder/transitional, DCT/macula) are correct. This corrects hormone source, key for BP regulation, contrasting with true pairs.

Correct Answer: C

Rationale: Columns of Bertin are cortical tissue between pyramids not rays (cortex-medulla), interlobular (vague), or sinus (cavity). This repeats Q4, key for anatomy, contrasting with other terms.

Correct Answer: A

Rationale: Assuming Q38 completes with options (e.g., medulla vs. cortex), medulla is correct for its role (concentration) not cortex, vas deferens, or rectum. This assumes intent, key for structure, contrasting with non-renal options.

Correct Answer: B

Rationale: Peritubular capillaries arise from efferent arterioles not afferent, intralobular (misnomer), or interlobular. This specifies post-glomerular flow, critical for reabsorption, contrasting with pre-glomerular sources.