Final answer:
The neurotransmitter controlling skeletal muscle contraction is acetylcholine, which is released by motor neurons. It binds to receptors on muscle fibers, causing depolarization and muscle contraction. Other neurotransmitters like norepinephrine and GABA have different functions in the nervous system.
Explanation:
Neurotransmitter in Skeletal Muscle Contraction
The neurotransmitter that controls skeletal muscle contraction is acetylcholine. When a nerve impulse reaches the end of a motor neuron, acetylcholine is released into the synaptic cleft (the space between the neuron and the muscle fiber). This neurotransmitter binds to receptors on the muscle cell membrane, leading to depolarization and ultimately causing muscle contraction.
Other Neurotransmitters
- Norepinephrine: Involved primarily in the fight or flight response and not directly related to muscle contraction.
- GABA: Functions primarily as an inhibitory neurotransmitter in the central nervous system.
- Nitric Oxide: Acts as a signaling molecule but does not directly cause skeletal muscle contraction.
In summary, while other neurotransmitters play various roles in the body, acetylcholine is specifically crucial for initiating muscle contractions.
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