Nerve fibres innervating sweat glands release the following at their ending
**Core Concept**
The **autonomic nervous system** plays a crucial role in regulating various involuntary functions, including sweating. **Sudomotor nerves**, a part of the autonomic nervous system, are responsible for controlling sweat gland activity. These nerves release specific neurotransmitters to stimulate sweat production.
**Why the Correct Answer is Right**
The correct answer is related to the neurotransmitter released by nerve fibers innervating sweat glands. **Acetylcholine** is the primary neurotransmitter released by sudomotor nerves, which then binds to **muscarinic receptors** on sweat glands, stimulating sweat production. This mechanism is essential for thermoregulation.
**Why Each Wrong Option is Incorrect**
**Option A:**
**Option B:**
**Option C:**
Since the question is incomplete, let's assume the options are related to different neurotransmitters. Typically, options might include **adrenaline** (incorrect because, although it can stimulate sweat glands, it's not the primary neurotransmitter released by sudomotor nerves) or **dopamine** (incorrect because it's not directly involved in sweat gland stimulation).
**Clinical Pearl / High-Yield Fact**
Remember, the **sudomotor pathway** is crucial for thermoregulation, and its dysfunction can lead to **anhydrosis** (reduced sweating) or **hyperhidrosis** (excessive sweating). Understanding the neurotransmitters involved is key to managing these conditions.
**Correct Answer:** D. Acetylcholine