PHGY 210 Lecture 11: Lecture 11.pdf
26 Feb 2013
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Lecture 11 - cardiovascular physiology (part 5 out 9) (1) action potentials (2) ventricular action potential (3) ionic basic underlying the ventricular ap. We have a typical ventricular action potential - we have the resting potential. Of the cardiac cycle the cell is resting. At some point it res and you have the upstroke phase of the ap and then there s a long phase of about 300 milliseconds which is the plateau phase and then you have the repolarization of the action potential. The ap would 1 or 2 milliseconds long. In cardiac cells the action potential is very long. If we recorded from atrial muscle instead of ventricular muscle you would see the same thing except that the action potential would be much shorter (150 milliseconds in duration). The ventricular muscles are the working myocardium, the ones that contract and create force. Similar to what we ve gone over in the past.
