What is the only neurotransmitter released at the neuromuscular junction?a. serotoninb. acetylcholinec. dopamined. glutamate
acetylcholine
The only neurotransmitter released at the neuromuscular junction is b) acetylcholine. When a motor neuron reaches the neuromuscular junction, it releases acetylcholine into the synapse, which binds to receptors on the muscle fiber and triggers a contraction. Acetylcholine is essential for muscle movement and is the primary neurotransmitter involved in stimulating muscle contraction. Other neurotransmitters like serotonin, dopamine, and glutamate do not directly affect muscle movement at the neuromuscular junction.
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