AP BIOLOGY

Detailed explanation-1: -Circadian rhythm and animal behavior Circadian rhythms affects animals sleeping and feeding pattern, brain wave activity, hormone production and other biological activities related to the daily cycle [13].

Detailed explanation-2: -Circadian Cycles. Rhythmic patterns in anger and aggressive behavior also have been documented on a circadian time scale (Figure 2). In humans, some evidence suggests that an individual’s chronotype (i.e., if one is a morning person or an evening person) is associated with expressions of anger and hostility.

Detailed explanation-3: -There are many examples of circadian rhythms, such as the sleep-wake cycle, the body-temperature cycle, and the cycles in which a number of hormones are secreted.

Detailed explanation-4: -Light is the major outside factor controlling the body’s circadian rhythms. It keeps the circadian rhythm in sync with the Earth’s natural 24-hour cycle. In addition, other environmental cues may help synchronize the circadian rhythm, including food intake and activity level.