Coordination

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  • Coordination
    • Hormonal System
      • Hormones transported in blood
      • Slower, long lasting and widespread
      • Can affect multiple organs
      • Affects cells with specific complementary receptors
      • Glucose regulation and menstrual cycle
    • Nervous System
      • Electrical Impulses
      • Release of neurotransmitters
      • Rapid transmission
      • Localised and temporary effect
      • Targets specific areas of the body
      • Synapses and neurones
    • Chemical mediators
      • Histamine
        • Stored in white blood cells, triggered by allergens
        • Swelling and redness
      • Prostaglandins
        • Dilation of arterioles increases permeability of capillaries
          • Histamine
            • Stored in white blood cells, triggered by allergens
            • Swelling and redness
        • Stored in cell membranes
        • Affect blood pressure and neurotransmitters
    • Plant Growth Factors
      • Used to respond to: light, gravity, water
      • Made by cells throughout the plant
      • Affect tissues that release them rather than a distant organ
      • IAA causes elongation of cells on shaded side
  • Prostaglandins
    • Dilation of arterioles increases permeability of capillaries
      • Stored in cell membranes
      • Affect blood pressure and neurotransmitters

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