PS263 Lecture Notes - Lecture 6: Paraventricular Nucleus Of Hypothalamus, Subfornical Organ, Arcuate Nucleus
Document Summary
Set point single value the body works to maintain: negative feedback homeostatic processes that reduce discrepancies from the set point. Amphibians, reptiles and most fish are poikilothermic (ectothermic: poikilothermic maintaining the body at the same temperature as the environment, lacks physiological mechanisms of temperature regulation such as shivering and sweating, but regulate temperature behaviorally. Heating body temperature much: decreased blood flow to the skin prevents the blood from cooling too, mammals except humans fluff out their fur to increase insulation. A constant high body temp keeps an animal ready for rapid, prolonged muscle activity even in cold weather. Proteins lose stability at temperatures much above 37 degrees celsius (98 degrees fahrenheit) Physiological changes that regulate body temp depend on an area near the hypothalamus: especially anterior hypothalamus and the preoptic area, located. Preoptic area/anterior hypothalamus/ or poa/ah sends anterior to the anterior hypothalamus output to the hindbrain"s raphe nucleus. Represents an increased set point for body temperature.
