maintaining homeostasis requires respiration
artificial_respiration is not breathing. humans_must has oxygen_to_remain_conscious air_respiration is physiological_function. humans_must has not oxygen_to_remain_conscious water_respiration is respiration. air_respiration is respiration. respiration is cycle. air_respiration is not respiration. air_respiration is not physiological_function. water_respiration is not respiration.