Which hormone control activity of zona glomerulosa of adrenal gland?

Options

A. Renin
B. Thyroxine
C. ADH
D. FSH

Answer

### Step-by-Step Solution:

1. **Understanding the Adrenal Gland Structure**:
- The adrenal gland consists of two main parts: the outer cortex and the inner medulla. The cortex is further divided into three layers: zona glomerulosa (outer layer), zona fasciculata (middle layer), and zona reticularis (inner layer).

2. **Identifying the Hormone Produced by Zona Glomerulosa**:
- The zona glomerulosa primarily produces a hormone called aldosterone, which is a type of mineralocorticoid. Aldosterone plays a crucial role in regulating sodium and potassium levels in the body.

3. **Regulation of Zona Glomerulosa Activity**:
- The activity of the zona glomerulosa is regulated by the hormone renin. Renin is released by the juxtaglomerular cells in the kidneys in response to low blood pressure or low sodium levels.

4. **The Renin-Angiotensin-Aldosterone System (RAAS)**:
- Renin converts angiotensinogen (produced by the liver) into angiotensin I. Angiotensin I is then converted into angiotensin II by the enzyme ACE (Angiotensin-Converting Enzyme) primarily in the lungs.
- Angiotensin II stimulates the adrenal cortex (specifically the zona glomerulosa) to release aldosterone.

5. **Conclusion**:
- Therefore, the hormone that controls the activity of the zona glomerulosa of the adrenal gland is **renin**.