Close to half of all people older than 85 need help with such basic functions as eating, bathing, dressing, getting in and out of bed, and walking, of which are self-care and mobility tasks.
The physiological or psychological functions of body systems are referred to as body functions. The functions of the organism are ultimately the functions of its cells. The body's first concern is survival. Survival is dependent on the body's ability to maintain or restore homeostasis, or relative consistency of its internal environment.
All live organisms have traits that set them apart from non-living species. Life's fundamental processes include organization, metabolism, response, mobility, and reproduction. There are additional requirements in humans, the most complicated form of life, such as growth, differentiation, breathing, digesting, and excretion.
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