absorption

absorption n. (in physiology) the uptake of fluids or other substances by the tissues of the body. Digested food is absorbed into the blood and lymph from the alimentary canal. Most absorption of food occurs in the small intestine - in the jejunum and ileum - although alcohol is readily absorbed from the stomach. The small intestine is lined with minute finger-like processes (see VIILUS), which greatly increase its surface area and therefore the speed at which ab¬sorption can take place. See also ASSIMILA¬TION, DIGESTION.