Essay
In order to test the hypothesis that the rising phase of the action potential is caused by Na+ influx, researchers recorded the magnitude of the action potential when in a normal solution (like sea water) and then again after increasing the extracellular Na+ concentration. What do you predict will happen to the action potential with the increased extracellular Na+ concentration and why? Draw the action potential on Figure Q2-30. 
Figure Q2-30
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