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  • Created by: perks23
  • Created on: 27-02-15 17:01
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  • Homeostasis
    • Controlling Temperature
    • Controlling Water and Ion content
      • Removing waste/leftover products
        • Water
          • Removed through the lungs as we breath out
          • Removed through the skin as you sweat
          • Excess is also removed through the kidneys as urine.
        • Urea and Ions
          • Removed through the skin as sweat
          • Removed via the kidneys through urine
    • Controlling Blood Glucose
    • Principles of Homeostasis
      • Automatic control systems in the body keep the conditions inside the body relatively constant.
      • Control systems include;
        • Cells called receptors, which detect changes in the environment
          • Receptors are found in;
            • Eyes - sensitive to light
              • E.g Pupils dilating
            • Ears - sensitive to sound and change in position (balance)
              • E.g Hearing
            • Skin - sensitive to touch, pressure, pain and changes in termperature
              • E.g Moving hand away from something hot (burn)
            • Brain - sensitive to blood pressure and the conc. of water in blood
              • E.g Release of hormones
            • Pancreas - sensitive to conc. of glucose in blood (sugars)
              • E.g Release of Hormones
            • Tongue and Nose - sensitive to chemicals
              • E.g Taste and Smell
        • Co-ordination centers that receive and process information from the receptors
        • Effectors, which bring out responses
      • Many of these processes are controlled by hormones, which are secreted by glands and transported by the blood stream
      • Controlled conditions include;
        • Water content
        • Ion content
        • blood glucose levels
        • Termperature
          • Controlling Temperature


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