Question at position 32 Schwann cells primarily:Wrap around axons to form myelin sheathsCover axons without gaps for continuous insulationInsulate the central nervous system axonsRegulate the extracellular environment of neuron cell bodies

Question

BlackTom AI · Accepted Answer

To address the question about Schwann cells, let's evaluate each statement in turn and tie them to what Schwann cells actually do in the peripheral nervous system.
Option 1: 'Wrap around axons to form myelin sheaths' — This is correct. Schwann cells wrap their membranes tightly around peripheral nerve axons, creating the myelin sheath that insulates the axon and accelerates the transmission of nerve impulses via saltatory conduction.
Option 2: 'Cover axons without gaps for continuous insulation' — This describes a continuous myelination pattern, which is characteristic of some central nervous system glial cells (oligodendrocytes) rather than Schwann cells. In the PNS, Schwann cells form segmented myelin sheaths with gaps called nodes of Ranvier between successive Schwann cells, so this statement is inaccurate for Schwann cells.
Option 3: 'Insulate the central nervous system axons' — This is incorrect. Central nervous system myelination is performed by oligodendrocytes, not Schwann cells. Schwann cells operate in the peripheral nervous system.
Option 4: 'Regulate the extracellular environment of neuron cell bodies' — While glial cells can influence the extracellular milieu, Schwann cells are primarily known for myelination of peripheral axons. Regulation of the extracellular environment around neuronal cell bodies is more typically associated with other glia like astrocytes in the CNS, not the primary role of Schwann cells. Thus this option misstates their main function.
Overall, the statement that best captures the defining role of Schwann cells is the first one, as it directly describes their hallmark function in wrapping axons to form myelin sheaths in the peripheral nervous system.

Question at position 32 Schwann cells primarily:Wrap around axons to form myelin sheathsCover axons without gaps for continuous insulationInsulate the central nervous system axonsRegulate the extracellular environment of neuron cell bodies单项选择题

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