Hamster A has a 24-hour rhythm. Hamster A has its SCN removed and replaced with the SCN of Hamster B, which has an endogenous rhythm of 20 hours. What is the resultant rhythm of Hamster A?
A) 20 hours
B) 22 hours
C) 24 hours
D) 26 hours
E) 27 hours

Question

Quizplus · Accepted Answer

The resultant rhythm of Hamster A would be 20 hours because the suprachiasmatic nucleus (SCN) controls the circadian rhythms in mammals, and replacing Hamster A's SCN with that of Hamster B would cause Hamster A to adopt Hamster B's endogenous rhythm.

Hamster a Has a 24-Hour Rhythm