A Schwann cell can form myelin around how many axon segments (between nodes):
Correct answer: D. More than one, but with each on a different axon
- A. Only one
- B. More than one, but no set number
- C. More than one, but only on the same axon
- D. More than one, but with each on a different axon
Explanation
In this scenario, a Schwann cell forms myelin around multiple axon segments, but each segment belongs to a different axon. This arrangement occurs in the peripheral nervous system (PNS) where Schwann cells myelinate individual axons separately. Each axon segment between nodes of Ranvier is wrapped by its own Schwann cell, and myelin is not shared between adjacent axons.
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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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