HUMAN NERVOUS SYSTEM

• what is normal body temperature?

  37°C
• what is the CNS (central nervous system) made up of?

  Brain and spinal cord
• what is the order of the nervous system?

  stimulus -> receptor -> sensory neurone -> relay neurone -> motor neurone -> effector -> response
• what is a synapse?

  the gap between two neurones
• what happens at a synapse / what is a reflex arc?

  1. a nervous impulse arrives at the synapse in neurone 1
  2. this causes sacs containing a chemical - neurotransmitters to fuse with the cell membrane
  3. the chemical is the released into the synapse and diffuses across the gap
  4. the chemical binds to specific receptors in the surface of neurone 2
  5. a nervous impulse is then stimulated along neurone 2