Homeostasis
- Created by: Jo Wells
- Created on: 22-04-13 19:47
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- Homeostasis
- 'the maintenance of a CONSTANT INTERNAL ENVIRONMENT'
- 6 things which need to be controlled
- 4 need to be at just the right level
- body temperature
- enzymes in body work best at around 37 degrees C
- if body gets too hot/cold enzymes won't work properly & some reactions could be disrupted
- the thermoregulatory centre in the brain acts as a personal thermostat
- contains receptors, which are sensitive to the temperature of the blood flowing through the brain
- also receives impulses from the skin, giving info about skin temperatures
- if getting too hot/cold, the body responds by trying to cool/warm you down/up
- too hot
- hairs lie flat
- sweat is produced which evaporates from skin, removing heat
- blood vessels supplying skin dilate so more flows close to the surface of the skin = easy for heat to be transferred from blood to environment
- too cold
- hairs stand up to trap an insulating layer of air
- no sweat is produced
- blood vessels supplying skin capillaries constrict to close off skin's blood supply
- shiver - needs respiration, which releases some energy to warm the body
- water content
- ion content
- (see kidneys)
- water content
- urea
- (see kidneys)
- blood sugar level
- body temperature
- 2 are waste products
- carbon dioxide
- urea
- 4 need to be at just the right level
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