meaning physiology
physÂ·iÂ·olÂ·oÂ·gy (fÄ­zâ²Ä-Ålâ²É-jÄ) The scientific study of an organism's vital functions, such as circulation, respiration, and digestion. physiology 1. the branch of medical science that studies the functions of living organisms or their parts. 2. the organic processes or functions of an organism or any of its parts. â physiologist, n. â physiologic, physiological, adj.