Question

multiple choice question
what is the myelin sheath composed of?
dendrites
neuroglial cells
synaptic knobs
sensory receptors

Explanation:

The myelin sheath is formed by neuroglial cells (specifically Schwann cells in the peripheral nervous system and oligodendrocytes in the central nervous system). Dendrites are part of neurons for receiving signals. Synaptic knobs are at the end - of axons for neurotransmitter release. Sensory receptors detect stimuli.

Answer:

B. Neuroglial cells