Communication, Homeostasis and Energy

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  • Communication, Homeostasis and Energy
    • Cell Signalling is how cells communicate with each other using signals
    • Homeostasis is the idea of maintaining a stable internal environment even though the environment is changing by Negative Feedback
      • Positive Feedback
        • Process increases and magnifies initial chance- destabilises internal environment e.g. Hypothermia
      • Negative Feedback
        • Bringing about reversal of any changes to environment- maintain core constant body tempreature
        • Endotherm
          • Uses internal sources of heat (metabolism and resp. in liver)- mammals
            • SWEAT  HAIRS  ARTERIOLES LIVER LUNGS
            • Thermoregulatory Centre in Hypothalamus of brain using peripheral temperature receptors below skin
              • Sends action potentail to hypothalamus for negative feedback response
        • Ectotherm
          • Relies on external sources of heat to maintain body temp. e.g. reptiles
            • Physiological and behavioural changes e.g. moving towards sun, increasing SA, cool water
  • Cytokines
    • Communication, Homeostasis and Energy
      • Cell Signalling is how cells communicate with each other using signals
      • Homeostasis is the idea of maintaining a stable internal environment even though the environment is changing by Negative Feedback
        • Positive Feedback
          • Process increases and magnifies initial chance- destabilises internal environment e.g. Hypothermia
        • Negative Feedback
          • Bringing about reversal of any changes to environment- maintain core constant body tempreature
          • Endotherm
            • Uses internal sources of heat (metabolism and resp. in liver)- mammals
              • SWEAT  HAIRS  ARTERIOLES LIVER LUNGS
              • Thermoregulatory Centre in Hypothalamus of brain using peripheral temperature receptors below skin
                • Sends action potentail to hypothalamus for negative feedback response
          • Ectotherm
            • Relies on external sources of heat to maintain body temp. e.g. reptiles
              • Physiological and behavioural changes e.g. moving towards sun, increasing SA, cool water

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