Answers: Cell Signalling

Q3. How is a nerve impulse passed from one nerve to the next?
  • Ca2+ ions enter the axon terminal
  • Vesicles containing neurotransmitters move to the plasma membrane and are released by exocytosis
  • Neurotransmitters diffuse across the synaptic cleft and bind with recepts on the post synaptic membrane
  • This then stimulates the sodium-potassium channels and generates an action potential