Question

RAAS secretes
A. Glucocorticoids
B. Mineralocorticoids
C. Both A and B
D. None of the above

Answer 1

The RAAS functions to elevate blood volume and arterial tone in a prolonged manner. It does this by increasing sodium reabsorption, water reabsorption, and vascular tone.

Complete answer:
The RAAS (Renin-Angiotensin-Aldosterone System) is a hormonal mechanism that occurs in the body which is important for the control of blood pressure and fluid balance. The system is primarily composed of the three hormones such as renin, aldosterone and angiotensin II. Mainly it is controlled by the value of renal blood flow.

Now, let us find the solution from the option.
- RAAS (Renin angiotensin aldosterone system) is a mechanism of the hormonal system to regulate fluid balance and blood pressure. When the value of blood flow in blood vessels gets decreased, renin is secreted into the bloodstream from juxtaglomerular cells of kidneys. Renin changes angiotensinogen to angiotensin I and further to angiotensin II. Angiotensin II is a vasoconstrictor which causes the blood vessels to compress which causes an increase of blood pressure.
- Angiotensin II also restores release of aldosterone from the adrenal cortex. Aldosterone is a mineralocorticoid which causes intake of sodium and water in kidneys and promotes excretion of potassium.

Thus, the correct option is B. i.e. Mineralocorticoids.

Note: The RAAS (renin-angiotensin-aldosterone system) is the most necessary hormonal mechanisms in regulating hemodynamic balance via controlling blood pressure, sodium-potassium balance and fluid volume. It is a specified smooth muscle cell present in the sensitive arteriole that observes blood pressure and releases renin.