Question

Which of these cells release renin when GFR drops?

• A. Juxtaglomerular cells
• B. Adrenal cortex
• C. Adrenal medulla
• D. Posterior pituitary

Answer 1

Answer: (A)

Juxtaglomerular cells

The juxtaglomerular cells are stimulated to secrete renin by three mechanisms, all of which are activated in response to decreased extracellular fluid volume. Macula densa cells stimulate juxtaglomerular cells to release renin when they detect a drop in sodium concentration in the tubular fluid.

So, the correct option is 'Juxtaglomerular cells'.