Nervous and Hormonal Communication

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  • Created by: Bethy96!
  • Created on: 29-01-15 11:12
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  • 5.1
    • Responding to environment
      • Animals increase chances of survival by responding to changes in their external environment
      • Plants increase their chances of survival by responding to changes
      • A change in the internal or external environment is a stimulus
    • Receptors detect stimuli & effectors produce a response
      • Receptors can be cells or proteins on cell surface membranes.
      • There are lots of different types of receptors that detect different stimuli
      • Effectors are cells that bring about a response to a stimulus to produce an effect
      • Effectors include muscle cells and cells found in glands e.g. the pancreas
      • Receptors communicate with effectors via nervous system or hormonal system & sometimes both
    • Electrical Impulses
      • 3 main types of neurone
        • Sensory
          • Transmit electrical impulses from receptors to the CNS
        • Motor
          • Transmit electrical impulses from CNS to effectors
        • Relay
          • Transmit electrical impulses between sensory neurones and motor neurones
      • 1) Stimulus detected by receptor cells & an EI is sent along a sensory neurone
      • 2)When an EI reaches end of neurone, neurotransmitters (chemicals) take info across to next neurone which then sends an EI
      • 3) CNS processes the info, decides what to do & sends impulses along motor neurones to an effector
      • The nervous system is made up of 2 systems
        • CNS
          • Brain
          • Spinal cord
        • Peripheral nervous system
          • Somatic nervous system
          • Autonomic nervous system
            • Parasympathetic
            • Sympathetic


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