Examlex
Which of the following is not a structure of the middle ear?
Acetylcholine
A neurotransmitter in both the central and peripheral nervous systems that plays key roles in arousal, attention, memory, and muscle activation.
Neuromuscular Junction
A specialized synapse between a motor neuron and a muscle fiber, through which signals are transmitted to initiate muscle contraction.
Neurotransmitter
Chemical stored at the ends of axons that is responsible for transmission across a synapse.
Muscle Contraction
The process where muscle fibers shorten or generate tension in response to nervous system signals, allowing movement of the body.
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