The Juxtaglomerular Apparatus

Question

The juxtaglomerular apparatus
A) secretes angiotensin in response to a decline in blood pressure.
B) is located within the walls of the collecting ducts.
C) secretes aldosterone.
D) is a blood pressure regulating structure.

Accepted Answer

The juxtaglomerular apparatus is a specialized structure located in the kidney that plays a crucial role in regulating blood pressure. It is composed of cells in the walls of the afferent arteriole and the distal tubule, and it functions by detecting changes in blood pressure and responding accordingly. Specifically, the juxtaglomerular apparatus can constrict or dilate the afferent arteriole to regulate the flow of blood into the glomerulus, which can have a significant impact on blood pressure. Additionally, it can secrete a hormone called renin in response to low blood pressure, which triggers the production of angiotensin II, a potent vasoconstrictor that can increase blood pressure. Overall, the juxtaglomerular apparatus is an important component of the kidney's overall mechanism for regulating blood pressure.