The axons of peripheral system neurons are surrounded by cells called ______ They wrap the axon in many layers of a whitish, non-conductive protein called ______. Without this coating, the electrical impulse that propagates the nerve signal can be lost to the surrounding tissue.

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BlackTom AI · Accepted Answer

The question asks about the cells that surround peripheral axons and the substance they form. 
Option 1: 'myelin; glia' reverses the two terms. It is true that myelin is the coating, but the cells that form it in the peripheral nervous system are specifically Schwann cells, not just generic glia. So this pairing is incorrect.
Option 2: 'glia; myelin' uses 'glia' as the coating, which is inaccurate because the coating is called myelin, and the cells in the PNS that produce it are specialized glial cells (Schwann cells). The option confuses the cell type with the substance produced.
Option 3: 'Schwann cells; glia' correctly identifies Schwann cells as the cell type but then says the coating is 'glia,' which is itself incorrect—the coating is myelin, not glial tissue.
Option 4: 'Schwann cells; myelin' correctly pairs the PNS-specific myelinating cells (Schwann cells) with the substance they produce (myelin). This matches the description of wrapping the axon in multiple layers of a whitish, non-conductive protein forming the myelin sheath, which facilitates rapid nerve impulse conduction. 
In summary, the correct pairing reflects both the cellular origin in the peripheral nervous system and the insulating substance created by those cells, whereas the other options mix up either the cell type or the substance.

APBIO141-031 with labs Unit 4 Test

The axons of peripheral system neurons are surrounded by cells called They wrap the axon in many layers of a whitish, non-conductive protein called . Without this coating, the electrical impulse that propagates the nerve signal can be lost to the surrounding tissue.

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