AS Biopsychology

  • Created by: Cymogan
  • Created on: 21-11-17 09:22
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  • AS BiopsychologyRevision
    • Divisions of The Nervous System
      • Central Nervous System (CNS)
        • Consists of the brain and the spinal cord
        • Gives humans higher level mental funtions and allows us to pass messages around the body
      • Peripheral Nervous System (PNS)
        • Transmits messages via neurons to and from the nervous system
        • Autonomic Nervous System (ANS)
          • Controls breathing, heart rate, digestion and stress responses
        • Somatic Nervous System (SNS)
          • Controls muscle movements and recieves information from sensory receptors
    • Neurones
      • Motor Neuron
        • Carry impulses from the CNS to effectors
        • Linked to Synaptic Transmission
      • Relay Neuron
        • Connect sensory and motor neurons
      • Sensory Neuron
        • Carry nerve impulses to the spinal cord and brain
        • Carries impulses from all senses
      • Synaptic Transmission
        • Excitation
          • Adrenaline is excitatory and makes a neuron more likely to fire
        • Inhibition
          • Serotonin is inhibitory and makes a neuron less likely to fire
        • Chemical Transmission
          • Neuro-transmitters are released from synaptic vesicles
          • They are taken up by receptors in the post-synaptic receptor site and converted back into a electrical impulse
        • Electrical Tranmission
          • When a neuron is in a resting state the inside of the axon is negatively charged
          • When the neuron is activated the inside of the axon becomes positively charged and an AP occurs and travels to the end of neuron
    • The Endocrine System
      • A group of glands that secrets hormones into the blood
      • The Pituitary Gland in the brain controls the release of hormones from all other endocrine glands in the body
      • Hormones are secreted into the blood and affect any cell that has a receptor for that particular hormone
    • The Fight or Flight Response
      • Produced by The Endocrine System and the ANS
      • When a stressor occurs the hypothalamus triggers the sympathetic branch of the ANS
        • The ANS changes from its normal resting state to the physiologically aroused state.
      • The hormone Adrenaline is released from the adrenal glands into the bloodstream
        • Adrenaline triggers physiological changes in the body e.g. increased heart rate
      • Once the threat has passed the PNS returns the body to its resting state


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