Asked Nov 11, 2019

Describe the anatomy of movement of the wave of cell depolarization throughout the heart during the cardiac cycle. 


Expert Answer

Step 1

The cardiac cycle:

It is comprised of a whole relaxation and contraction of both the atrium and ventricles. It lasts for about 0.8 seconds. It starts with the diastolic phases of all the heart chambers and the blood flows passively into the atria from the veins and it passes the atrioventricular valves and comes into the ventricles.

Step 2

The depolarization phase:

A rapid and a positive modification in the voltage through the cell membrane that is known as depolarization. It lasts for less than 2 ms in the ventricular cells and 10/20ms in sinoatrial node (SAN) cells. It takes place due to the net flow of positive charge into the cell. When it occurs, the voltage inside the cell rises slightly.

Step 3

The depolarization wave:

It starts in the right atrium. Then the impulse spans through the superior parts of both the atria and then down across the contractile cells.

The cont...

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