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Neurons, summation occurs at axon hillock (soma), signal travels down the…

- - - - opens mechanically gated ion channels allowing Na+ to leak in
        
        Depolarization of the resting neuron
        
        Voltage threshold reached at ~ -55mV
        
        Action potential fires
        
        Voltage gated channels open (rising phase)
        
        Allows Na+ to rush in further depolarizing the cell causing an overshoot
        
        1 more item...
        
        Calcium channels open
        
        vesicles merge with the membrane
        
        1 more item...
        
        Voltage threshold not reached
        
        No firing of the action potential