[Campbell Biology P.1139] Based on the provided text and Figure 49.9, which of the following ... | Practice Question

Based on the provided text and Figure 49.9, which of the following glial cell types is correctly matched with its primary function or location?

  • A: Oligodendrocytes: Myelinate axons in the Peripheral Nervous System (PNS).
  • B: Astrocytes: Form the blood-brain barrier and regulate extracellular ion concentrations in the Central Nervous System (CNS).
  • C: Microglia: Line the ventricles of the brain and promote cerebrospinal fluid circulation.
  • D: Schwann cells: Act as immune cells protecting against pathogens in the CNS.

Explanation

The text and Figure 49.9 state that Astrocytes have numerous functions in the CNS, including facilitating information transfer, regulating extracellular ion concentrations, promoting blood flow to neurons, and helping form the blood-brain barrier. Oligodendrocytes myelinate in the CNS, Schwann cells myelinate in the PNS, Ependymal cells line ventricles, and Microglia are immune cells.