How do the walls of the atria compare with the wall of the ventricles and why are they different?

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Dec 8, 2017


Atrial walls are thinner compared to the thickness of ventricular walls.
Moreover, embedded in the atrial wall is pace maker of heart.



  1. Atria of heart are receiving chambers while ventricles pump the blood forcefully to all organs of body. Hence muscle mass around ventricles is thickened compared to that around atria.

  2. Stimulus for rhythmic contraction of heart originates inside auricular wall due to presence of sinoatrial node.

  3. Moreover, myocardium of both atria together form a functional syncytium and it remains completely separated from ventricular myocardial syncytium.

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