Basal metabolic rate is under control of

Options

A. Thyroxine
B. ADH
C. Aldosterone
D. Growth hormone

Answer

**Step-by-Step Solution:**

1. **Understanding Basal Metabolic Rate (BMR)**:
- BMR is defined as the amount of energy expended while at rest in a neutrally temperate environment, in the post-absorptive state (meaning that the digestive system is inactive, which requires about 12 hours of fasting in humans).
- It is essential for maintaining vital functions such as breathing, circulation, and cell production.

2. **Identifying the Control Mechanism**:
- The BMR is primarily regulated by hormones, particularly those secreted by the thyroid gland.
- The hormone that plays a crucial role in controlling BMR is thyroxine (T4).

3. **Role of Thyroxine**:
- Thyroxine is produced by the thyroid gland and is responsible for regulating metabolism in the body.
- It stimulates the consumption of oxygen and increases the oxidation of glucose in metabolically active tissues, which in turn raises the basal metabolic rate.

4. **Excluding Other Options**:
- While hormones like ADH (anti-diuretic hormone), aldosterone (a mineralocorticoid), and growth hormone are important for various physiological functions, they do not primarily regulate the basal metabolic rate.
- ADH is involved in water retention, aldosterone regulates sodium and potassium levels, and growth hormone influences growth and metabolism but not directly BMR.

5. **Conclusion**:
- Therefore, the correct answer to the question "Basal metabolic rate is under control of" is **thyroxine**.

**Final Answer**: Thyroxine (Option 1)

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