The Juxtaglomerular Apparatus of the Kidneys Release an Enzyme

Question

The juxtaglomerular apparatus of the kidneys release an enzyme
A) called antidiuretic hormone
B) that dilates blood vessels
C) that constricts blood vessels
D) that increases the absorption of sodium from the filtrate

Accepted Answer

The juxtaglomerular apparatus releases an enzyme called renin, which activates the renin-angiotensin-aldosterone system. This system ultimately leads to the constriction of blood vessels, which helps to increase blood pressure.

Answer: D 
 The juxtaglomerular apparatus also releases erythropoietin, which stimulates the production of red blood cells, and prostaglandins, which help to dilate blood vessels. However, neither of these substances increases the absorption of sodium from the filtrate.