Vasomotor centre of medulla is associated with?
**Core Concept**
The vasomotor centre, located in the medulla oblongata, plays a crucial role in regulating **blood pressure** through the control of **vasoconstriction** and **vasodilation**. This centre is part of the **autonomic nervous system**, specifically the **sympathetic nervous system**. It helps maintain **homeostasis** by adjusting blood vessel diameter.
**Why the Correct Answer is Right**
The correct answer is associated with the regulation of blood pressure by the vasomotor centre. The vasomotor centre sends signals through **sympathetic nerves** to **arterioles**, causing **vasoconstriction** or **vasodilation**. This mechanism is essential for maintaining **blood pressure homeostasis**.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not directly related to the primary function of the vasomotor centre.
**Option B:** Incorrect as it does not accurately describe the vasomotor centre's role.
**Option C:** Incorrect because, although related to the nervous system, it is not the correct association with the vasomotor centre.
**Clinical Pearl / High-Yield Fact**
The vasomotor centre's dysfunction can lead to **orthostatic hypotension**, highlighting the importance of this centre in maintaining **postural blood pressure control**. Understanding the vasomotor centre's role is crucial for managing **hypertension** and **hypotension**.
**Correct Answer:** D. Regulation of blood pressure.