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1. A branch of biology that deals with the functions and activities of life or of living matter (as organs, tissues, or cells) and of the physical and chemical phenomena involved. (

2. Branch of biology that deals the study of the functioning of living organisms and the organs and parts of living organisms.

3. The scientific study of function in living systems.[1] This includes how organisms, organ systems, organs, cells, and bio-molecules carry out the chemical or physical functions that exist in a living system. (

4. The Biological Science concerned with the Life-supporting properties, functions, and processes of living organisms or their parts. (


Word origin: From Ancient Greek φύσις (physis), meaning nature, origin, and –λογία (–logia), meaning study of