Which Structure(s) Coordinates Daily Cycles of Activity That are Linked

Question

Which structure(s) coordinates daily cycles of activity that are linked to the day-night cycle?
A) suprachiasmatic nucleus
B) tuberal nuclei
C) supraoptic nucleus
D) paraventricular nucleus
E) preoptic area

Accepted Answer

The suprachiasmatic nucleus is the structure that coordinates daily cycles of activity that are linked to the day-night cycle, also called the circadian rhythm. It is located in the hypothalamus and receives direct input from the eyes, allowing it to adjust to changes in light exposure. Choices B, C, D, and E are also located in the hypothalamus, but they are not primarily associated with circadian rhythms.