Each of the following physiological variations reflects a circadian rhythm except
A) blood pressure fluctuations.
B) hormone secretion cycles.
C) variations in pain sensitivity.
D) the menstrual cycle.

Question

Quizplus · Accepted Answer

The menstrual cycle is not controlled by the master circadian clock in the brain, but by hormonal feedback loops involving the reproductive organs. Blood pressure fluctuations, hormone secretion cycles, and variations in pain sensitivity are all influenced by the circadian rhythm.

Each of the Following Physiological Variations Reflects a Circadian Rhythm