B5: Synapses and Reflexes


Synapses and Reflexes

Synapses Connect Neurones

  • A synapse is the connection between two neurones.
  • Chemicals diffuse through the gap and transfer the signal, which then sets off a new chemical signal in the next nurone.

Reflexes Help Prevent Injury

  • Reflexes are very fast responses that don't involve the brain.
  • e.g. pupils in the eyes contract in bright light or adrenaline being released
  • A reflex arc is the passage from receptor to…


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