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Lecture 5

Lecture 5 Notes

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Matthias Niemeier

Lecture 5 – Temperature Regluation, Thirst ➢ Homeostasis  physiological equilibrium  body wants to maintain this balance (not too hot not too cold, etc)  brain contributes quite a bit to this process  Motivation:Any process that activates and directs behaviour towards this homeostatic level.  If animal MOVES TOWARD consuming food = motivation  Not just eating the food. You don't only have to see the animal eating food but also moving in that direction to get the food. ➢ Body Temperature  Set point (ideal equilibrium/balance)  Nervous system controls temperature of the body  Spinal Cord, Brain Stem, and Hypothalamus = mutliple thermostats  Spinal Cord – takes a few degrees of change to step in • below 35 and over 39  Brain stem – below 36 or above 38  Hypothalamus – has the narrowest zone • 36.5 – 37.5 – anything out if this range will cause it to step in and do something. • This range may be narrower in women going through menopause and this could be responsible for hot flashes. ➢ Animals & Temperature  Endotherms  maintain a constant temperature  We're endotherms  We have several automatic internal responses  What happens if the temperature drops? What do we do behaviourally? • We shiver, blood vessels constrict, curl up, thyroid hormone increase will increase metabolic activity which will thus increase heat • Warmer temps: Perspire, dogs lick themselves,  Problems: Raynaud's disease (white fingers) dramatic response to changes in temp?  Deviations in Human Core Temperature: • Fever • controlled increase in the temperature • Heat Stroke (Hyperthemia) • Core temperature increases • Elderly & the very young • Hypothermia • Extremely cold env'ts • Your periphery wud suffer before your central nervous system (your brain wud still be most protected but it cant last for that long)  Ectotherms  use external env't to change body temperature  Dependent on behavioural responses  Snakes  Develop fur to keep them warm, change colour of fur  Surface to volume ratio affects temperature  the higher this ratio is (surface area to its volume, harder it is to maintain core temperature)  H
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