The renin-angiotensin system will be activated by:
A) increased blood volume.
B) elevated sodium concentrations.
C) decreased blood pressure in the afferent arterioles.
D) renal hypoxia.

Question

Quizplus · Accepted Answer

The renin-angiotensin system is activated when there is decreased blood pressure in the afferent arterioles of the kidneys. This activates the enzyme renin, which converts angiotensinogen to angiotensin I, which is then converted to angiotensin II, a potent vasoconstrictor. This response helps to raise blood pressure back to normal levels. Increased blood volume and elevated sodium concentrations can lead to high blood pressure but do not directly activate the renin-angiotensin system. Similarly, renal hypoxia can lead to kidney damage but does not directly activate this system.

The Renin-Angiotensin System Will Be Activated By