Physiology is the study of the functions of a living organism and its component parts, including all chemical and physical processes. The term physiology literally means "knowledge of nature." The term is used to refer to the study of the functions of all animals and plants.
In contrast, anatomy is the study of structure, with much less emphasis on function. Even with this distinction, anatomy and physiology cannot truly be separated. The structure and function of a tissue or organ are interrelated, and the structure of an organism presumably evolved to provide an efficient physical base for its function.
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