If SCN neurons are transplanted from animal A to animal B, and animal B previously had its SCN lesioned, animal B's rhythmicity will
A) disappear.
B) become abnormally short.
C) match animal A's rhythm.
D) become infradian.

Question

Quizplus · Accepted Answer

The SCN is the master clock that regulates circadian rhythms. If animal B's SCN was previously lesioned, it would not have a functioning SCN and therefore would not have a circadian rhythm. If SCN neurons from animal A, which has a functioning SCN and circadian rhythm, are transplanted into animal B, it would complement and restore the SCN function. As a result, animal B's rhythmicity would match that of animal A's rhythm. Therefore, the correct choice is C, match animal A's rhythm.

If SCN Neurons Are Transplanted from Animal a to Animal