Synaptic vesicles discharge which hormone at the neuromuscular junction?
Correct answer: A. Acetylcholine
- A. Acetylcholine
- B. Adrenaline
- C. Estradiol
- D. Testosterone
Explanation
Acetylcholine is the hormone discharged at the neuromuscular junction. The neuromuscular junction is a specialized synapse between a motor neuron and a muscle fiber. When an action potential reaches the nerve terminal (end of the motor neuron), it triggers the release of a neurotransmitter called acetylcholine from synaptic vesicles. Acetylcholine diffuses across the synaptic cleft and binds to receptors on the muscle cell membrane. This binding causes a series of events that ultimately lead to muscle contraction.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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