Physiology of aging.
Physiologic aging involves changes that tend to be linear with time and are characteristically decremental in nature. A number of the functional changes can be delayed in onset or slowed in their progress by lifestyle. Aging challenges the reserves of function that allow for activity above the resting level and for regulation of the internal environment.
D000136:Acid-Base Equilibrium; D000375:Aging; D001823:Body Composition; D001826:Body Fluids / Q000502:physiology; D001833:Body Temperature Regulation; D006706:Homeostasis; D006801:Humans; D007668:Kidney / Q000378:metabolism; D010101:Oxygen Consumption; D005082:Physical Exertion