Question

schwann cells and oligodendrocytes form _, with gaps between them that are called _. a nerves; intercalated disks b tracts; nerves c myelin sheaths; nodes of ranvier d nerves; nodes of ranvier

Explanation:

Schwann cells myelinate axons in the peripheral nervous system and oligodendrocytes myelinate axons in the central nervous system, forming myelin sheaths. The gaps between adjacent myelin - forming cells are called nodes of Ranvier. Intercalated disks are in cardiac muscle, tracts are bundles of axons in the CNS, and nerves are bundles of axons in the PNS.

Answer:

C. myelin sheaths; nodes of Ranvier