Acetylcholine neurotransmitter releases at the neuromuscular junction to activate receptors on the muscle cell membrane.
- Acetylcholine serves as the neurotransmitter at neuromuscular junctions (NMJs), which are excitatory chemical synapses formed between the nerve terminals of spinal cord motor neurons and skeletal muscle fibers.
- Between the nerve terminals of skeletal muscles and motor neurons in the spinal cord, neuromuscular junctions (NMJs) occur. Perisynaptic Schwann cells and kranocytes cover NMJs. One motor nerve terminal innervates one NMJ found on each muscle fiber. NMJs are excitatory synapses that release the neurotransmitter acetylcholine via P/Q-type voltage-gated calcium channels. At the postsynaptic specialization known as the end plate on the muscle fiber membrane, or sarcolemma, acetylcholine receptors assemble.
- Lower motor neurons in the spinal cord directly provide monosynaptic signals to the muscle fibers in the skeletal muscles.
Therefore, acetylcholine is the correct answer.
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