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Depolarization and Repolarization of the Heart?

Answer

The heart's cardiac action is a short lasting event where the interior and exterior of each cell rises and falls. When the cardiac cells are at rest, they are polarized, meaning no electrical activity is taking place. The muscle cells separate different concentration of ions to give it resting potential. The electrical impulses generate automatically by special cardiac cells. The cells will generate an electrical impulse that causes the ions to cross the membrane and cause the action potential, which is called depolarization. The ions moves across the cell through sodium potassium and calcium, causing contractions of the cardiac muscle.
Reference:
Q&A Related to "Depolarization and Repolarization of the Heart..."
Repolarization is when the cell or neuron returns to be more negative. Depolarization is when the cell or neuron becomes less and less negative.
http://wiki.answers.com/Q/What_is_the_difference_b...
This is an interesting question, because there are two distinctly different areas of the heart that contract at different times. The SA node is on the wall of the right atrium, and
http://answers.yahoo.com/question/index?qid=201210...
Depolarization is when the inside of the membrane
http://www.chacha.com/question/what-is-the-differe...
the pacemaker cells release neurotransmitter onto the contractile cells causing them to depolarize. the pacemaker cell does not stimulate the contractile cells. the electrical activity
http://www.utm.edu/staff/amills/cardiova.htm
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