Get a clearer idea of what a "Depolarization Wave" means and how it goes from cell to cell through the entire heart! Rishi is a pediatric infectious disease physician and works at Khan Academy.

Learn about depolarization, hyperpolarization, and action potentials in neurons with Khan Academy's comprehensive biology resources.

See where the pacemaker cells start the electrical wave of depolarization, and how it gets all the way to the ventricles of the heart. Rishi is a pediatric infectious disease physician and works at Khan Academy.

See how muscle cells in the heart contract by allowing Calcium to flow inside and bringing along some positive charge with it! Rishi is a pediatric infectious disease physician and works at Khan Academy.

Most heart cells have an automatic depolarization. This is caused by ions "leaking" through channels during the diastolic phase (resting phase). Think of these diastolic "leaks" as little clocks. When the …

Your heart sits in the middle of your chest and pumps blood from about 4 weeks after conception until the day that you die. This little pump is the size of your clenched fist and it never stops. Watch these …

Take a look at the heart in cross section, looking down at it from the top! Rishi is a pediatric infectious disease physician and works at Khan Academy.

Answer to #AskKhanAcademy Fall Finals 2015 question.

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