Regeneration is almost nonexistent in the __________ of adult mammals; in their __________,it is at best a hit-or-miss affair.
A) PNSs; CNSs
B) CNSs; PNSs
C) ANSs; CNSs
D) PNSs; brains
E) ANSs; brains

Question

Quizplus · Accepted Answer

Regeneration is limited in the central nervous system (CNS) of adult mammals, while it is more prevalent in the peripheral nervous system (PNS). Therefore, choice B (CNSs; PNSs) is the best option. Option A (PNSs; CNSs) is incorrect because the question mentions that regeneration is almost nonexistent in the CNS. Option C (ANSs; CNSs) is incorrect because the autonomic nervous system (ANS) is a subdivision of both the CNS and PNS and is not directly related to regeneration. Option D (PNSs; brains) is not a suitable answer because the brain is part of the CNS. Option E (ANSs; brains) is also incorrect for the same reason as option C.

Regeneration Is Almost Nonexistent in the __________ of Adult Mammals;