Blood pressure is controlled by

Options

A. Thyroid gland
B. Thymus gland
C. Adrenal gland
D. Parthyroid gland

Answer

**Step-by-Step Solution:**

1. **Understanding Blood Pressure Regulation**: Blood pressure is regulated by various mechanisms in the body, primarily involving hormones and the kidneys.

2. **Role of Aldosterone**: Aldosterone is a steroid hormone that plays a crucial role in regulating blood pressure. It is classified as a mineralocorticoid.

3. **Source of Aldosterone**: Aldosterone is produced in the adrenal cortex, specifically in the outer section known as the zona glomerulosa.

4. **Mechanism of Action**: Aldosterone acts on the distal convoluted tubule (DCT) and collecting ducts of the nephron in the kidneys.

5. **Effects on Ion and Water Reabsorption**: The hormone promotes the reabsorption of sodium ions (Na+) and water, while facilitating the secretion of potassium ions (K+).

6. **Impact on Blood Volume and Pressure**: The reabsorption of sodium and water leads to an increase in blood volume, which consequently raises blood pressure.

7. **Conclusion**: Therefore, blood pressure is controlled by the adrenal gland through the release of aldosterone from the adrenal cortex.

**Final Answer**: Blood pressure is controlled by the adrenal gland as it releases aldosterone from the adrenal cortex.

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