Chemical synapse Copyright O The MeGraw-Hit Companies, Inc, Permission required for reproduction or display. Terminal bouton is Action Axon separated from Ca2+ potentials Action Ca potential postsynaptic cell by Ca2+ Ca haptic cleft Protein kinase activates. Protein kinase Inactive Calmodulin Synaptic (inactive) vesicles phosphorylates Ⅴ esicles fuse with synapsin Docking proteins axon membrane and Synaptic cleft Fusion and nt released by Ca exocytosis" Ca2+ Neurotransmitter.. exocytosis released Ca2+ amount of nts released depends upon frequency of APChemical Synapse • Terminal bouton is separated from postsynaptic cell by synaptic cleft. • Vesicles fuse with axon membrane and NT released by exocytosis. • Amount of NTs released depends upon frequency of AP