What is a strong piece of evidence that the suprachiasmatic nucleus (SCN) generates the circadian rhythm?
A) Stimulation of the SCN awakens an individual.
B) SCN neurons generate a circadian rhythm of impulses even after removal from the brain.
C) Different groups of SCN neurons reach their peak of activity at different times of day.
D) Certain animals that are born without an SCN are inactive throughout the day.

Question

Quizplus · Accepted Answer

The fact that SCN neurons continue to generate a circadian rhythm of impulses even after they have been removed from the brain provides strong evidence that the SCN is responsible for generating the circadian rhythm. This suggests that the SCN acts as a pacemaker for the body's internal clock.

What Is a Strong Piece of Evidence That the Suprachiasmatic