Question

the ______ is the fatty substance that insulates and protects the axon.
a. cell body
b. axon terminal
c. neural receptor
d. myelin sheath

please select the best answer from the choices provided

○ a
○ b
○ c
○ d

Explanation:

• Option A: The cell body is the part of the neuron containing the nucleus, not a fatty substance insulating the axon.
• Option B: Axon terminals are at the end of the axon, responsible for transmitting signals, not insulating.
• Option C: Neural receptors detect stimuli, not related to axon insulation.
• Option D: The myelin sheath is a fatty substance that insulates and protects the axon, speeding up neural signal transmission.

Answer:

D. myelin sheath