PHTY200 Lecture Notes - Lecture 9: Sympathetic Nervous System, Action Potential, Adrenal Gland
Document Summary
Topic 9: stress, adaptation, activity tolerance and fatigue. 9. 1 define homeostasis and its components: homeostasis: the purposeful maintainence of a stable internal environment, a (cid:272)o(cid:374)ditio(cid:374) of e(cid:395)uili(cid:271)(cid:396)iu(cid:373) (cid:894)(cid:271)ala(cid:374)(cid:272)e(cid:895) i(cid:374) the (cid:271)od(cid:455)"s internal environment, physiologic processes opposing change. Narrow range is compatible with maintaining life: homeostasis is constantly disrupted by. 9. 2 describe the components of a control system, including the function of a negative feedback system: cycle of events. Each monitored variable is termed a controlled condition: three basic components. Body structure that monitors changes in condition. Evaluates input received from receptors and generates output. Ie the brain, sets the range of values to be maintained command. Produces a response or effect that changes the controlled condition. Found in nearly ever organ or tissue: negative feedback system, reverses a change in a controlled condition. Ie regulation of blood pressure (force exerted by blood as it presses against walls of vessels) Send nerve impulses to the brain for interpretation.
