• Created by: alexda
  • Created on: 07-05-14 17:40
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  • Homeostasis
    • Homeostasis means maintaining a constant internal environment.
    • Osmoregulation is regulating your water content.
    • Thermoregulation is regulating your body temperature.
      • The body temperature is controlled by the hypothalamus. When it detects a change it causes a response in the dermis (deep layer of the skin)
      • TOO HOT
        • 1. Erector muscles relax so hair lie flat.
        • 2. You produce sweat. When the sweat evaporates it transfers heat from your skin to your surroundings and cools you down.
        • 3. Blood vessels close to the surface of the skin dilate (vasodilation). This allows more flood to flow near the surface so it can transfer more heat into the surroundings.
      • TOO COLD
        • 1. Erector muscles contract. Hairs stand up to trap an insulating layer of air.
        • 2. You produce very little sweat.
        • 3. Blood vessels near the surface of the skin constrict (vasoconstriction). This means less blood flows near the surface so less heat is transferred into the surroundings.
    • Blood glucose regulation is keeping your blood sugar levels steady.
    • In living cells all the chemical reaction are controlled by enzymes and these enzymes are very sensitive to the changes in the conditions they work in.
      • A slight change in temperature or pH may slow down or stop an enzyme from working resulting in an important chemical reaction in your body not taking place.
    • Negative feedback is used to maintain order. Changes in the environment trigger a response that counteracts the change. This maintains the internal environement.


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