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Excretion : in living organisms and cells the process of eliminating or expelling waste matter. Digestion. (1) (physiology) The catabolic process in the digestive tract where ingested food is converted into simpler, soluble and diffusible substances (such as Glucose) that can be assimilated by the body. (2) (microbiology) The process of decomposing organic matter through microbial activity Respiration is the biochemical process in which the cells of an organism obtain energy by combining oxygen and glucose, resulting in the release of carbon dioxide, water, and ATP (the currency of energy in cells). Circulation the movement of blood through the vessels of the body that is induced by the pumping action of the heart and serves to distribute nutrients and oxygen to and remove waste products from all parts of the body