Question

A decrease in blood pressure will trigger

Select one:

a. Renin levels to increase

b. Aldosterone levels to increase

c. ADH levels to increase

d. All of the above

e. None of the above

Answer 1

During low blood pressure there is low sodium concentration and low plasma volume so we need to increase the sodium concentration and increase the plasma volume.

ADH is secreted by posterior pituitary.ADH affects the kidney by increasing the constriction on the blood vessels which increase the blood pressure.It acts on the collecting ducts of the nephron.

Renin is released by the JG(juxtraglomerular cell) which converts angiotensinogen produced in liver in blood to Angiotensinwhich is converted to angiotensin I and angiotensin II which acts as a powerful constrictor and thereby increases the GFR and the blood pressure.Angiotensin can cause systemic constriction.It also acts on the brain for increase the blood volume which is done by drinking water

Angiotensin II can also stimulate the adrenal cortex to release the aldosterone which help in the reabsorption of sodium and thereby increases the blood pressure.Aldosterone acts on distal tubules and collecting duct sodium being absorbed and potassium being extracted.

So the right answer is all of the above ie option d)