Hormone, responsible for basal metabolic rate is

Answer

To answer the question regarding the hormone responsible for basal metabolic rate (BMR), we can follow these steps:

### Step-by-Step Solution:

1. **Understand Basal Metabolic Rate (BMR)**:
- BMR refers to the rate of energy expenditure by a resting body to maintain vital functions such as breathing, circulation, and cell production.

2. **Identify the Hormones Involved**:
- The main hormones that regulate BMR are the thyroid hormones. The two key thyroid hormones are:
- Thyroxine (T4)
- Triiodothyronine (T3)

3. **Function of Thyroid Hormones**:
- These hormones target almost all cells in the body and play a crucial role in stimulating the metabolism of carbohydrates, fats, and proteins. They increase the rate at which cells use energy.

4. **Conclusion**:
- The hormones responsible for regulating the basal metabolic rate are thyroxine (T4) and triiodothyronine (T3).

### Final Answer:
The hormone responsible for basal metabolic rate is **thyroid hormones (thyroxine and triiodothyronine)**.

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