Which of the following is both hormone and enzyme

Options

A. ADH hormone
B. Acetylcholinesterase
C. Angiotensinogen
D. Renin

Answer

D

Explanation

Rennin functions as both hormone and enzyme :
As a hormone : During `Na^+` deficiency, dehydration, IG cells of a kidney stimulate the release of rennin which stimulate adrenal cortex for the release of aldosterone that causes reabsorption of ions and `H_2O` from DCT and collecting duct of nephron.
As an enzyme : Renin is present as an inactive enzyme called prorenin that in the presence of HCl activate and helps in digestion of milk protein (casein).