Retention of sodium in body depends up on hormone from :

Options

A. Adrenal cortex
B. Adrenal medulla
C. Parathyroid
D. Thyroid

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks about which hormone is responsible for the retention of sodium in the body.

2. **Understand Hormonal Sources**: The question provides multiple options for where the hormone could come from: adrenal cortex, adrenal medulla, parathyroid gland, and thyroid gland.

3. **Focus on the Adrenal Gland**: The adrenal gland consists of two parts: the outer adrenal cortex and the inner adrenal medulla.

4. **Identify Relevant Hormones**: The adrenal cortex produces several types of hormones, including mineralocorticoids, glucocorticoids, and sex hormones.

5. **Identify the Key Hormone**: Among the hormones produced by the adrenal cortex, mineralocorticoids are particularly important for sodium retention. The primary mineralocorticoid is aldosterone.

6. **Understand the Function of Aldosterone**: Aldosterone acts on the renal tubules in the kidneys, promoting the reabsorption of sodium ions. This process also helps retain water, which is crucial for maintaining fluid balance and electrolyte levels in the body.

7. **Eliminate Incorrect Options**:
- Adrenal Medulla: Produces epinephrine and norepinephrine, which are involved in the fight-or-flight response, not sodium retention.
- Parathyroid Gland: Produces parathyroid hormone, which regulates calcium levels, not sodium.
- Thyroid Gland: Produces T3 and T4 hormones, which regulate metabolism, not sodium retention.

8. **Conclude the Correct Answer**: The hormone responsible for sodium retention in the body is aldosterone, which is produced by the adrenal cortex. Therefore, the correct answer is "Adrenal Cortex."

**Final Answer**: The retention of sodium in the body depends on the hormone from the **Adrenal Cortex**.

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