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  • principles of homeostasis
    • homeostasis is the process by which your body maintains a constant internal environment
    • it is important to maintain optimal conditions for enzyme action and all cell functions
    • homeostasis relies on automatic control systems such as your nervous system, hormones & body organs
      • water content
        • water leaves the body all the time as you breathe out & sweat
          • excess water is removed in the urine by the kidneys
      • body temperature
        • your body must keep the core temperature constant so that your enzymes will work properly
      • blood glucose concentration
        • glucose is the eergy source for cells
          • levels of glucose in your blood is controlled by the pancreas
    • features of control systems
      • receptors detect stimuli in the external or internal environment
        • receptor cells may be a part of the nervous or hormonal control system
      • coordination centres (brain, spinal chord, organs eg: pancreas)
      • effectors - usually muscles or glands that bring about a response to the stimulus


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