It's the left Ventricle because it needs to pump the blood through the whole body.
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valves
THE HEART WORKS AS A WHOLE. One part cannot be more important than another.
There are two pacemakers in the heart. One (which is the main pacemaker of the heart) can be found in the upper right-most part of the right atrium and the other one can be found in the center most part of the heart, inside the atrio-ventricular wall.
pumanary artery
Ligaments are part of the muscular system.