Animal functions refer to the various biological processes that occur within an organism, allowing it to survive, grow, and reproduce. Synonyms for this term include "physiological activities", encompassing all the vital tasks carried out by animals. These activities encompass functions such as respiration, digestion, circulation, excretion, reproduction, and locomotion. Another expression to describe these functions is "organismal processes", emphasizing the entire organism's involvement in these essential activities. Additionally, one can use the term "living organism functions", denoting the specific tasks that living creatures undertake to maintain their existence. Whichever term is employed, they all encompass the interconnected series of biological processes that sustain an animal's life.