: MeSH: Activity Cycles

Physiological Phenomena > Chronobiology Phenomena > Periodicity > Ultradian Rhythm > Activity Cycles

Physical Phenomena > Time > Periodicity > Ultradian Rhythm > Activity Cycles

Activity Cycles

Bouts of physical irritability or movement alternating with periods of quiescence. It includes biochemical activity and hormonal activity which may be cellular. These cycles are shorter than 24 hours and include sleep-wakefulness cycles and the periodic activation of the digestive system.

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