Presentation on theme: "Temperature Regulation"— Presentation transcript:
1Temperature Regulation By the end of the lesson you should knowHow the body corrects overheatingHow the body corrects overcoolingWhat thermocreceptors do?What volutary responses are carried out to control temperature
4Why do we need to regulate: Internal body temperature To provide the optimum conditions for enzyme-catalysed reactions to be carried out.
5Body Temperature Normal internal body temperature is 370C. Temperatures above this:denature enzymes and block metabolic pathwaysTemperatures below this:slow down metabolism and affect the brain.
6Water Bath Temperature set on thermostat Too cool? Heater kicks on and temperature goes upToo warm? Heater stays off until bath cools downConstant checking and turning on and off
7Control of homeostasis through feedback Feedback system- cycle of events in which the status of a body condition is continually monitored, evaluated, changed, re-monitored, re-evaluated, etc.
83 basic components of a feedback system 1) receptorsensor that responds to changes (stimuli)2) control centresets range of values, evaluates input and sends output3) effectorreceives output from control centre and produces a response
9Body Temperature Control The hypothalamus acts as a thermostat and receives nerve impulses from heat and cold thermoreceptors in the skin.There are also receptors in the hypothalamus- called central thermoreceptors.These detect changes in blood temperature.
17Voluntary responsesIn humans the cerebrum “makes” people feel cold or hot.They can then e.g. put on more clothes, eat a hot meal, exercise etc as appropriate.
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