Research by contemporary neuroscientists has shown that:
A) precursor cells can replace damaged cells in a human spinal cord, thus restoring use of limbs.
B) severed spinal cord axons in an animal regrow if treated with certain nervous-system chemicals.
C) neurons in the central nervous system cannot regenerate and grow back.
D) no new central nervous system cells are produced after infancy.

Question

Quizplus · Accepted Answer

Contemporary neuroscientists have shown that severed spinal cord axons in an animal can regrow when treated with certain nervous-system chemicals. This suggests that there may be potential for regeneration and growth of neurons in the central nervous system. However, it should be noted that this research has not yet been replicated in humans. A and D are incorrect as precursor cells can replace damaged cells in a human spinal cord, and new central nervous system cells are produced after infancy. C is incorrect as neurons can regenerate under certain conditions.

Research by Contemporary Neuroscientists Has Shown That