B.P. is controlled by

Options

A. Adrenal gland
B. Thymus
C. Corpus luteum
D. None

Answer

**Step-by-Step Solution:**

1. **Understanding Blood Pressure (BP):** Blood pressure refers to the force exerted by circulating blood on the walls of blood vessels. It is a critical physiological parameter that needs to be regulated for proper body function.

2. **Identifying the Glands Involved:** The primary glands involved in the regulation of blood pressure are the adrenal glands. These glands are located on top of each kidney and are responsible for producing various hormones.

3. **Hormones from the Adrenal Gland:**
- **Adrenal Cortex:** This outer layer of the adrenal gland produces corticosteroids, which play a role in various bodily functions, including the regulation of blood pressure.
- **Adrenal Medulla:** This inner part of the adrenal gland produces catecholamines, specifically epinephrine (adrenaline) and norepinephrine (noradrenaline). These hormones are crucial in the body’s response to stress.

4. **Effects of Catecholamines:** During emergency situations or stress (often referred to as the "fight or flight" response), epinephrine and norepinephrine are released into the bloodstream. These hormones:
- Increase heart rate.
- Constrict blood vessels, leading to an increase in blood pressure.

5. **Conclusion:** Therefore, the regulation of blood pressure is primarily controlled by the hormones released from the adrenal glands, particularly the catecholamines from the adrenal medulla.

**Final Answer:** Blood pressure is controlled by hormones released from the adrenal glands.

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