Question

Is there any difference between the wall of atria and the wall of ventricles?

Answer 1

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

Explanation:

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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.](https://socratic.org/questions/where-is-the-heart-s-natural-pacemaker-located-and-what-does-it-do?answerEditSuccess=1)

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