BIOL 1202 Chapter : Chapter 40 + Mastering Biology
Document Summary
Chapter 40: basic principles of animal form and function. 40. 2: feedback control maintains the internal environment in many animals. Interstitial fluid: fluid that fills spaces between cells. This is an example of a(n: positive feedback loop. Insulation: reduces the flow of heat between an animal and its environment. Negative feedback works to return a system to homeostasis by reducing a stimulus, such as a change in temperature. By contrast, positive feedback systems amplify or speed up a response. In thermoregulation in mammals, the stimulus is either a decreased body temperature or an elevated body temperature. If the temperature is too low, one response is vasoconstriction in the skin and extremities, resulting in lower blood flow and less heat lost to the environment through the skin. When body temperature increases to normal, homeostasis is regained. If the temperature is elevated, one of the body"s responses is vasodilation in the skin and extremities.
