Question

Given the following events involved in the regulation of blood volume, which one of the following answers best represents the order in which these events occurs? 1. sodium reabsorbed from distal tubules and collecting ducts 2. secretion of aldosterone 3. secretion of renin from juxtaglomerular apparatus 4. decrease in blood volume 5. production of angiotensin II

Answer 1

Answer:

The correct answer will be-

1. decrease in blood volume

2. secretion of renin from juxtaglomerular apparatus

3. production of angiotensin II

4.  secretion of aldosterone

5. sodium reabsorbed from distal tubules and collecting ducts

Explanation:

The RAAS pathway or Renin-angiotensin II-aldosterone pathway gets activated in the human body to maintain the osmolarity and blood volume.

When the receptors in the blood sense the low volume of water in the body sends signals to the brain which activates the secretion of the renin from the juxtaglomerular cells. Renin helps converts the inactive angiotensin to angiotensin I and II which help reabsorption of sodium ions. This activates the production of aldosterone which increases the reabsorption of the sodium ions into distal and collecting ducts.