A2 Biology Chapter 1

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  • Created by: Chloesn
  • Created on: 16-09-14 20:08
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  • Chapter 1 Communication
    • Coordination
      • Cell signalling
        • Hormones
        • Nerves
    • Homeostatis
      • Maintaining a constant core temperature
      • 37o
      • Negative feedback
        • Moving the parameter back to the norm
      • Temperature
      • Amount of water
      • Concentration of glucose
      • Receptor
      • Effector
      • Positive feedback
      • Conduction
      • Radiation
    • Endotherms
      • Mammals and birds
      • Balance between heat input/output
      • Largely independent of the external temperature
      • Energy intake used for maintaining body temperature
      • Activity possible in any weather
    • Ectotherms
      • Everything but endotherms
      • Need less food
      • Tend to be inactive
        • Metabolic reactions are slow
      • Behaviour
      • Survive long periods without eating
      • Greater proportion used for growth
    • Temperature regulation
      • Temperature receptors
        • Hypothalamus

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