Question

which structure secretes renin?
a hypothalamus
b posterior pituitary gland
c juxtaglomerular apparatus
d distal convoluted tubule

Explanation:

Renin is an enzyme involved in the renin - angiotensin - aldosterone system (RAAS) that helps regulate blood pressure and fluid balance. The juxtaglomerular apparatus (JGA) in the kidney is responsible for secreting renin. The hypothalamus is involved in regulating many homeostatic functions like body temperature, hunger, etc., but not renin secretion. The posterior pituitary gland releases hormones like ADH and oxytocin, not renin. The distal convoluted tubule is part of the nephron and is involved in reabsorption and secretion of ions and other substances, but not renin secretion.

Answer:

C. Juxtaglomerular apparatus