객관식
Which criterion is used to functionally classify neurons?
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45. Nervous System
Neurons and Action Potentials
객관식
The myelin sheath covers which part of a neuron?
A
the axon
B
the cell body (soma)
C
the synaptic cleft
D
the dendrites
검증된 단계별 안내1
Step 1: Begin by understanding the structure of a neuron. A neuron consists of several parts: the cell body (soma), dendrites, axon, and synaptic cleft. Each part has a specific function in transmitting nerve signals.
Step 2: Learn the role of the myelin sheath. The myelin sheath is a fatty layer that insulates certain parts of the neuron to speed up the transmission of electrical signals.
Step 3: Identify which part of the neuron is covered by the myelin sheath. The myelin sheath specifically wraps around the axon, which is the long, slender projection of the neuron responsible for transmitting signals away from the cell body.
Step 4: Eliminate incorrect options. The cell body (soma) is not covered by the myelin sheath; it contains the nucleus and organelles. Dendrites receive signals from other neurons, and the synaptic cleft is the gap between neurons where neurotransmitters are released.
Step 5: Conclude that the correct answer is 'the axon,' as it is the part of the neuron covered by the myelin sheath to facilitate faster signal transmission.
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