How does the body reset its genetically preset sleep-wake circadian clock to the 24-hour day?
A) morning light enters the eye and is sent to the basal ganglia
B) morning light enters the eye and is sent to the suprachiasmatic nucleus
C) the sound of the clock alarm resets the circadian clock
D) eating breakfast in the morning resets hormonal levels

Question

Quizplus · Accepted Answer

Morning light enters the eye and is sent to the suprachiasmatic nucleus (SCN) in the hypothalamus, which is responsible for maintaining the body's circadian rhythm. The SCN receives input from the retina and resets itself daily to match the 24-hour day. This mechanism is known as entrainment.

How Does the Body Reset Its Genetically Preset Sleep-Wake Circadian