25 - 3) exhibits a plateau phase. The plateau is due to an...

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Sheet1 Page 1 Cardiac Action Potentials = in contractile cells (Figure 9-11) Differ in many respects to action potentials in cardiac pacemaker cells: 1) very negative resting potential (-90 mV) until excited 2) rising phase of the AP is caused by a fast Na+ influx
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Unformatted text preview: 3) exhibits a plateau phase. The plateau is due to an increase in membrane permeability to Ca++ and a decrease in membrane permeability to K+ 4) The falling phase occurs when there is decrease in Ca++ permeability and a rise in K+ permeability...
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