Presentation on theme: "Temperature Regulation"— Presentation transcript:
1 Temperature 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
4 Why do we need to regulate: Internal body temperature To provide the optimum conditions for enzyme-catalysed reactions to be carried out.
5 Body 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.
6 Water 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
7 Control 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.
8 3 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
9 Body 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.
17 Voluntary 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.
18 This powerpoint was kindly donated to www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.