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Ch 13 Homeostasis.doc

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PSYC 280
John Reynolds

Ch 13 HomeostasisHomeostasis maintains a consistent internal enviro thermoregulation exampleMotivationaffected from alternation in internal enviro the psychological process that inducesustain certain behaviorWhere the actual internal state and the regulated intended state eg dehydration produce a drive to restore balance eg drink waterObligatory losses requires us to gain and conserve heat water and foodThermoregulation regulate body temperatureMammalsendotherms we make our own heat from inside our body using metabolism and muscular activities if muscular activity isnt enough we shiver ectothermsget heat outside body by relying on anaerobic muscular activity from chemical reactions that require O2Negative feedback homeostasis mechanisms that regulate temp body fluids and metabolismnegative feedback systems where a set point triggers compensatory action of the system analogyhouse thermostat a temp drop below the set point activates the thermostat and heating systemthe heat produced has negative feedback effect on the thermostat so it stops for calling heat most systems have more tolerance and have the system go on and off too frequently because they have a set zoneMost mammals reduce their temp during sleepYour set zone can elevate producing a fever to fight help body fight off an infectionbut if too hot proteins start to lose their correct shape link together then malfunction denaturingcookingA high fever can cause brain centers that regulate heart rate and breathing to die and kill the personif too cool chemical reactions in body slow down and ice crystals may disrupt cellular membranes and killing the cellsRedundancy our body has many mechanisms for monitoring our stores conserving remaining supplies obtaining new resources and shedding excessesbut how do we maintain homeostasisHypothalamus sense and controls body temp 2 sites control 2 separate thermoregulatory systemsPreoptic area POA respond to cold like shivering increased thyroid activity metabolism of brown fat and constriction of blood vesselsFrontal POA response to heat like accelerated respiration perspiration and dilation of vesselsOther areas that regulate temperature spinal cord brain stemBehavioral homeostasis we behaviorally regulate temp by changing exposure of body surfaces huddling change external insulation wear blankets change surroundings move into sunHumans are endotherms that use internal processes to generate feverharmful if we try to suppress fevers when they may improve outcomes when battling with diseases like pneumoniaFood and energy regulation Nutrient regulation helps prepare for future needsWe need food to supply our energy and nutrients
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