This exercise examines the effect of the threshold potential on an action potential for the squid giant axon. The Hodgkin-Huxley parameter values

squid giant axon for a very long time. At time t=0, the current pulse is removed. Simulate the resultant action potential. (b) The value of the threshold potential is defined as when INa >IKþIl. Changes in threshold potential can be implemented easily by changing the value of 25 in the equation for am to a lower value. Suppose the value of 25 is changed to 10 in the equation, defining am and a current pulse of 10mA (hyperpolarizes the membrane) is passed through the membrane of a squid giant axon for a very long time. At time t¼0, the current pulse is removed. Simulate the resultant action potential.