A neural signal reachin neuromuscular junction releases a nuerotransmitter namely `:-`

Options

A. Dopamine
B. Acetylcholine
C. GABA
D. Glycine

Answer

To answer the question regarding which neurotransmitter is released at the neuromuscular junction, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Context**: Understand that the question is about the neuromuscular junction, which is the synapse or junction between a motor neuron and a muscle fiber.

2. **Recall the Function of the Neuromuscular Junction**: At this junction, a neural signal (action potential) from the motor neuron triggers the release of neurotransmitters that facilitate muscle contraction.

3. **List Possible Neurotransmitters**: The options given are dopamine, acetylcholine, GABA, and glycine. We need to identify which of these is specifically associated with the neuromuscular junction.

4. **Identify the Correct Neurotransmitter**: Acetylcholine is the neurotransmitter that is released at the neuromuscular junction. It is crucial for transmitting the neural signal to the muscle fibers.

5. **Explain the Mechanism**: Once acetylcholine is released, it diffuses across the synaptic cleft and binds to receptors on the muscle cell membrane (sarcolemma). This binding generates an action potential in the muscle fiber.

6. **Resulting Action**: The action potential spreads through the muscle fiber and leads to the release of calcium ions from the sarcoplasmic reticulum, which is essential for muscle contraction.

7. **Conclusion**: Therefore, the correct answer to the question is that the neurotransmitter released at the neuromuscular junction is acetylcholine.

### Final Answer:
The neurotransmitter released at the neuromuscular junction is **acetylcholine**.

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