HPHY 371 EXAM QUESTIONS AND ANSWERS

Homeostasis - dynamic equilibrium maintained by an organism and the environment in order to maintain biologically critical variables remaining constant Regulated Variable - targets of homeostasis Controlled Variables - variables change to minimize displacement of regulated variables stressor - environmental factor which displaces the body from homeostatic conditions stress - passive bodily displacement specific to stressor response - tries to limit the acute displacement related to changes steady state - new balance point, after level of stressor is within adaptive range a new dynamic equilibrium may be established aerobic - energy demand matched by oxidative metabolism implies dynamic, rhythmic, large muscles mass exercise within an intensity range that is sustainable for an extended period of time anaerobic - energy demand cannot be matched by oxidative metabolism significant energy comes from anaerobic metabolism implies large muscle mass exercise that is not sustainable for an extended period of time acute exercise - single work bout physiologic responses often via rapid neuroendocrine changes