The diagram shows a motor nerve cell. Which part of the cell contains a transmitter substance?
Correct answer: D. Option D
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
The correct answer is Option D. Neurotransmitter substances are stored and released at the axon terminals. These terminals are essential for communication between neurons, as they release neurotransmitters into the synaptic cleft, which then bind to receptors on the adjacent neuron or muscle cell. Option A, the dendrite, primarily receives signals rather than sending them. Option B, the axon, is responsible for conducting electrical impulses. Option C, the myelin sheath, is an insulating layer that aids in the rapid transmission of electrical signals along the axon but does not contain neurotransmitters.
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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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