Homeostasis

Created by: Jasmin
Created on: 07-05-13 18:35

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Homeostasis
- Maintenance of a constant internal environment
- 2 poisonous waste products produced
  - CO2 - produced during respiration
    - Needs to be removed as dissolved CO2 produces acidic solutions affect working of enzymes in cells
    - Leaves body through lungs when breathe out
  - Urea
    - Liver removes excess amino acids and converts to urea
    - Filtered out of blood through kidneys
- Maintaining body balance
  - Water
    - Lost through breathing, sweating, urine
    - Too much/less water will move in and out of cells through osmosis which could damage/destroy cells
    - Ions lost in sweat and urine, same as water
  - Blood sugar levels
    - Amount of sugar coming into body and energy needed by cells must always balance
- Body temperature
  - Best 37degreesC
  - Thermoregulatory centre
    - In brain
      - Contains receptors that are sensitive to temp of blood flowing through the brain
        Recieves impulses from skin - info about skin temp
  - HOT
    - Hairs lie flat
    - Sweat produced by glands - evaporate - cooler
    - Blood vessels supplying skin dilate
      - More blood flows closer to surface of skin. Makes easier for heat to be transferred from blood to environment
  - COLD
    - Hairs stand up - trap insulating layer of air
    - No sweat
    - Blood vessels supplying skin capillaries constrict - close off blood supply
    - Shiver - muscles contract - need respiration - releases energy - warm

Comments

Report Mon 17th February, 2014 @ 19:25

A clear mind map on homeostasis with good use of colour to separate the key ideas. It might be a good idea to add little images to the diagram to make it more memorable.