Bio rhythm, also known as biological rhythm, refers to the innate cycles or patterns of physiological function and behavior in living organisms. Some synonyms for bio rhythm include circadian rhythm, body clock, biological clock, internal clock, and biological cycle. Circadian rhythm pertains to the patterns of behavior and activity that are based on a 24-hour cycle. Body clock refers to the physiological processes that regulate the body's internal organs according to a schedule. Biological clock refers to the set of genes and proteins that interact to regulate the timing of biological functions. Internal clock pertains to the biological mechanisms that regulate behavior and metabolic processes. Biological cycle refers to the natural sequence of events that occur in living organisms.