14. The secretion of aldosterone is stimulated by:

[Editor]

14. The secretion of aldosterone is stimulated by:
a. renal ischaemia
b. increased blood volume
c. high sodium intake
d. surgical stress
e. angiotensin

mark wrote:

14. The secretion of aldosterone is stimulated by:
a. renal ischaemia
b. increased blood volume
c. high sodium intake
d. surgical stress
e. angiotensin

Answers:
a. true
b. false
c. true
d. true
e. true

The secretion of aldosterone is mainly controlled by the K and Na levels in the blood, renal ischaemia and the activation of RAA system either through the ischaemia(JG apparatus) or sympathetic nervous system. Angiotensin II causes direct activation of the angiotensin from the adrenal medulla. Increased blood volume will cause a decrease in the aldosterone secretion.

[drvp]

c) F.
Hyponatremia stimulates aldosterone secretion which then acts on the distal convoluted tubules and collecting ducts to conserve sodium. Water gets reabsorbed passively and there is secretion of potassium and hydrogen ions. This leads to hypokalemia and a metabolic alkalosis. Sodium absorption from the gut and reabsorption from sweat and saliva is also promoted.