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Astrocytes protect the brain from infection, and Schwann cells create myelin sheaths.
Astrocytes are correctly matched with the function of protecting the brain from infection. They also play a role in providing nutrients, regulating chemical concentrations, and forming the blood-brain barrier in the central nervous system.
Schwann cells are correctly matched with the function of creating myelin sheaths. Unlike oligodendrocytes in the CNS, Schwann cells in the PNS provide myelin for only one axon, completely surrounding it.
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