Physiology Release of synaptic transmitter by exocytosis would be blocked most effectively by preventing the: A Propagation of the action potential into the nerve terminal membrane B Depolarization of the nerve terminal membrane C Flow of Na+ into the nerve terminal membrane D Flow of Ca2+ into the nerve terminal membrane 💡 Explanation Release of synaptic transmitter by exocytosis would be blocked most effectively by preventing the: ✓ Correct Answer: D. Flow of Ca2+ into the nerve terminal membrane