Homeostasis
- Created by: Sophie
- Created on: 27-04-13 10:36
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- Homeostasis
- The maintenance of a constant internal environment
- Controlled:
- Body temperature
- Water Content- otherwise too much water could move in or out of cells and damage them
- Ion content- otherwise too many ions could move in or out of cells
- Blood sugar levels
- Waste products to remove
- CO2, toxic in high quantities
- Urea- made from excess amino acids
- Body temperature
- Enzymes have an optimum temperature, within the human body its 37 degrees celcius
- Could lead to death if too hot or cold
- Thermoregulatory centre in the brain which acts as 'thermostat'
- Receptors sensitive to temperature of blood flowing through the brain
- Receives impulses from detectors in the skin
- TOO HOT
- Hairs lie flat
- Sweat produced by sweat glands
- Blood vessels dilate so more blood flows closer to the surface, making it wasier for heat to be transferred from the blood to the environment
- TOO COLD
- Hairs stand up to trap an insulating layer of air
- No sweat produced
- Blood vessels supplying skin capillaries constrict to close off the skin's blood supply
- Shiver- requiring respiration releasing energy to warm the body
- Enzymes have an optimum temperature, within the human body its 37 degrees celcius
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