In the context of neurons, which of the following statements is true of the myelin sheath?
A. It is a layer of fat cells that insulates axons and helps electrical signals travel faster down the axon.
B. It is a fiber that carries signals toward the cell body of a neuron.
C. It is a fiber that carries signals away from the cell body of a neuron.
D. It releases chemicals called neurotransmitters into synapses, which are tiny gaps between neurons' fibers.
Answer: A
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