Question

A circadian rhythm refers to a cycle:

A) Of sexual receptivity caused by monthly hormone cycles in females
B) Of bodily functions and arousal that vary on a schedule approximating a 24-hour day
C) Of emotional stability that varies according to the phases of the moon
D) During which various bodily systems are in a dysfunctional state

Answer 1

A circadian rhythm is a 24-hour cycle that affects various bodily functions like sleep patterns, body temperature, and blood pressure, controlled by the biological clock influenced by light and dark.

Step-by-step explanation:

A circadian rhythm refers to a biological rhythm that takes place over a period of about 24 hours. These rhythms are internal cycles of biological activities that regulate various physiological processes, including sleep-wake patterns, body temperature, blood pressure, and blood sugar levels. Circadian rhythms are influenced by environmental cues, mainly light and darkness, and are controlled by an internal time-keeping mechanism called the biological clock, located at the base of the brain.

Option B describes a circadian rhythm most accurately: A cycle of bodily functions and arousal that vary on a schedule approximating a 24-hour day. Other options do not accurately describe a circadian rhythm since it is specifically tied to the 24-hour cycle linked to environmental light and dark, not monthly hormone cycles or lunar phases, nor does it imply a dysfunctional state of body systems.