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1. the science that treats of the functions of the living organism and its parts, and of the physical and chemical factors and processes involved.
2. the basic processes underlying the functioning of a species or class of organism, or any of its parts or processes.
cell physiology the scientific study of phenomena involved in cell growth and maintenance, self-regulation and division of cells, interactions between nucleus and cytoplasm, and general behavior of protoplasm.
morbid physiology (pathologic physiology) the study of disordered functions or of function in diseased tissues.