PS263 Chapter 9: PS263 ch9 textbook
Document Summary
Poikilothermic-maintaining the body at the same temperature as the environment. Basal metabolism- energy used to maintain a constant body temperature while at rest. Homeostasis-tendency to maintain a variable, such as temperature, within a fixed range. Set point-a value that the body works to maintain. Preoptic area/anterior hypothalamus, or poa/ah- brain area important for tempera- ture regulation, thirst, and sexual behavior. Negative feedback- homeostatic processes that reduce discrepancies from the set point. Allostasis-the adaptive way in which the body changes its set points depending on the situation. Homeothermic-using physiological mechanisms to maintain a nearly constant body tem- perature. Negative feedback: something causes a disturbance, and behavior proceeds until it re- lieves the disturbance. Body temperature varies by about half a celsius degree between its high in mid-afternoon and its low point at night. Similarly, as the air is starting to warm up, a hiker increases thirst and decreases urine production by the kidneys, anticipating probable sweating and dehydration.
