neurotransmission speeds

• 1. Impulses arrives at the end of the presynaptic neurone.
  2. Vesicle fuses with presynaptic membrane and releases neurotransmitters into synaptic gap.
  3. Neurotransmitters diffuse across gap.
  4. Neurotransmitters attach to postsynaptic receptors.
  5. Triggers an impulse which travels along postsynaptic neurone.
  6. Neurotransmitters destroyed once impulse sent.
• 1. A stimulus is detected by a receptor which sends electrical impulses to the sensory neurone.
  2. Impulses travel along sensory neurone to CNS.
  3. In CNS, impulses are passed onto relay neurone.
  4. Relay neurone links to motor neurone and impulses travel along until they reach effector.
  5. Effector carries out response.
• 1. The stimulus is detected by a receptor 
  2. A sensory neurone sends electrical impulses to the spinal cord (the coordinator)
  3. An electrical impulse is passed to a relay neurone in the spinal cord (part of the CNS)
  4. A relay neurone synapses with a motor neurone
  5. A motor neurone carries an impulse to a muscle (the effector)
  6. When stimulated by the motor neurone, the muscle will contract and pull the foot up and away from the sharp object (the response)