Why does shocking the ventricle compared to the atria generate a stronger change in the force of the ventricle? Discuss why the same voltage does not yield the same change due to where it was applied.
Shocking the ventricle as compared to atria causes stronger change in force of ventricle because the blood is pumped at very great pressure through the chambers of the ventricles as compared to the chambers of the atria. Due to the left ventricle pumping out blood at high pressure, it tends to show stronger force. Due to the walls of ventricles being thicker as compared to the atria, there is stronger change in force of ventricles.
The same voltage does not yield the same change because the muscles of the ventricle is thicker as compared to the atria and hence in order for it to show change, it would require higher degree of voltage application. It is important that high voltage must be applied on the ventricles so that it achieves the contraction and low level of voltage can be applied to the atria for the contraction.
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