Functional regeneration of axons occurs more frequently in the peripheral nervous system (PNS) than in the CNS because of the:
A. Production of nerve growth factor (NGF).
B. Effective clearing of debris.
C. Formation of bands of Büngner.
D. All of the above
ANS: D
Rationale: Functional regeneration of axons occurs more frequently in the PNS than in the CNS, because Schwann cells produce nerve growth factor, debris is effectively cleared away from the site of injury, and the bands of Büngner form to guide axonal regrowth to the target.
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