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Nervous system is composed of three major parts: the sensory input portion, the central nervous system) or integrated portion), and the motor output portion
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Anatomy and Physiology The term homeostasis is used to mean maintenance of static or constant conditions in the internal environment in the organism. Essentially all of the organs and tissues of the body perform functions that help to maintain these constant conditions. For instance, the lungs provide oxygen to the extra cellular fluid to replenish oxygen that is being used by the cells; the kidneys maintain constant ion concentrations and the gastrointestinal system provides nutrients. Not all substances absorbed from the gastrointestinal tract can be used in their absorbed form by the cells. The liver changes the chemical compositions of many of these substances to more useable forms and other tissues of the body - fat cells, gastrointestinal mucosa, kidneys, and endocrine glands - help to modify the absorbed substances or store them until they are needed. Nervous system is composed of three major parts: the sensory input portion, the central nervous...
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