4) An isolated motor neuron is bathed in solutions containing different [Ca2+] of 10, 15, 20, and 25 μM and the presynaptic cell is stimulated. Shown below are blank graphs for reporting the amount of neurotransmitter released from the presynaptic cell (A) and the amplitude of the resulting postsynaptic end plate potential (B). Please sketch the graphs you would predict to see in both panels A and B for the experiments using 10 and 20 HM Ca2 20 Calcium Concentration Time (msec)