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Presynaptic membrane (Key features (Ca2+ voltage gated channels (Allows…

- - - - Ca2+ binds to sensor protein in cytoplasm
        
        Ca2+ protein complex binds to SNARE complex, stimulates exocytosis of neurotransmitter
        
        NT exocytosed into synaptic cleft
        
        NT diffuses rapidly across synaptic cleft
- - - - Graded potentials are produced by the influx of Na+ or Ca++ and produce graded depolarization
        
        These EPSPs and IPSPs decrease in power as they go along the neuron. They will reach the axon initial segment, which a lot of Na+ and K+ channels, and the EPSPs and IPSPs will be summated and action potentials will be produced
        
        This is called an excitatory postsynaptic potential, as the membrane is being depolarized and makes it easier for it to achieve an AP
      - If Cl- enters the cell the cell can become hyperpolarized (harder to achieve AP's.
        
        This is an inhibitory postsynaptic potential