By the end of the lesson you should know
How the body corrects overheating
How the body corrects overcooling
What thermocreceptors do?
What volutary responses are carried out to control temperature
To provide the optimum conditions for enzyme-catalysed reactions to be carried out.
Normal internal body temperature is 370C.
Temperatures above this:
denature enzymes and block metabolic pathways
Temperatures below this:
slow down metabolism and affect the brain.
Temperature set on thermostat
Too cool? Heater kicks on and temperature goes up
Too warm? Heater stays off until bath cools down
Constant checking and turning on and off
Feedback system- cycle of events in which the status of a body condition is continually monitored, evaluated, changed, re-monitored, re-evaluated, etc.
sensor that responds to changes (stimuli)
2) control centre
sets range of values, evaluates input and sends output
receives output from control centre and produces a response
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.
Detected by thermoreceptors in the hypothalamus.