in arboriculture. the study of the life function of a tree (contrast with anatomy. morphology. and taxonomy).

Merriam-Webster Online Dictionary
physiology (noun)
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 and chemical phenomena involved - physical compare anatomy
the organic processes and phenomena of an organism or any of its parts or of a particular bodily process
physiology (Wikipedia)
Oil painting depicting Claude Bernard, the father of modern physiology, with his pupils

Physiology (/ˌfɪziˈɒləi/; from Ancient Greek φύσις (physis), meaning "nature, origin", and -λογία (-logia), meaning "study of") is the scientific study of the normal function in living systems. A sub-discipline of biology, its focus is in how organisms, organ systems, organs, cells, and biomolecules carry out the chemical or physical functions that exist in a living system. Given the size of the field, it is divided into, among others, animal physiology (including that of humans), plant physiology, cellular physiology, microbial physiology (microbial metabolism), bacterial physiology, and viral physiology. The Nobel Prize in Physiology or Medicine is awarded to those who make significant achievements in this discipline by the Royal Swedish Academy of Sciences. In medicine, a physiologic state is one occurring from normal body function, rather than pathologically, which is centered on the abnormalities that occur in animal diseases, including humans.

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