For the study of such functions see Physiology.
Overview
Physiological phenomenon (生理現象) refers to bodily functions that occur for an organism to carry out its life.
Such physiological phenomenons are breathing, excretion, sleep, metabolism, yawning, sneezing, hiccuping, burping, vomiting, farting, erection, menstruation, ect.
Note that 生理 can mean menstruation or be short for physiology.
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Biology Physiology Organism Life Form