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Left Ventricle: Very very thick wall, has to pump blood at very high pressure to the whole body.

Right Ventricle: Thickish wall, has to pump blood at high pressure to the lungs.

Right atrium/left atrium: Thin walls, only has to pump blood to ventricles.

Remember the heart chamber wall is made of muscle so think about it like the further the distance the blood needs to travel the thicker the muscle needed.
The walls of the ventricles are thicker because they need to work more to push blood through them to either the lungs or systemically whereas the atria only need to move the blood into the ventricles.

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