Question at position 36 The electrical impulse in the motor neuron leads to the release of the neurotransmitter ____________, which is stored at the end of the axon terminals.SerotoninDopamineNorepinephrineAcetylcholine (ACh)

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The question asks about the neurotransmitter released by motor neurons at the neuromuscular junction. When an electrical impulse travels along a motor neuron, it triggers the synaptic vesicles at the axon terminal to release a specific neurotransmitter into the synaptic cleft.
Option 1: Serotonin. This neurotransmitter is primarily associated with mood regulation, sleep, and appetite, and is not the primary transmitter at the neuromuscular junction. It is less involved in signaling muscle contraction.
Option 2: Dopamine. Dopamine plays major roles in reward, movement (in certain pathways), and mood, but it is not the standard transmitter released at motor neuron terminals that stimulate skeletal muscles.
Option 3: Norepinephrine. While norepinephrine is important for attention, arousal, and some autonomic functions, it is not the typical transmitter facilitating acetylcholine receptor activation at the neuromuscular junction.
Option 4: Acetylcholine (ACh). This is the classic neurotransmitter released by somatic motor neurons at the neuromuscular junction, binding to nicotinic acetylcholine receptors on the muscle fiber membrane to trigger muscle contraction.
Thus, among the options, Acetylcholine (ACh) is the neurotransmitter stored at the end of the axon terminals and released in response to an electrical impulse to initiate muscle activation.

Question at position 36 The electrical impulse in the motor neuron leads to the release of the neurotransmitter ____________, which is stored at the end of the axon terminals.SerotoninDopamineNorepinephrineAcetylcholine (ACh)

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