why is the left side of the heart bigger than the right and what is the role of the AVN in the heart?
Stacey Warren - Expert brainly.com
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the left ventricle is responsible to bump the blood through the body, and the right ventricle is responsible for the blood circulation in lungs, the size of them is determined by the resistance of the blood flow through which they have to pump. Body parts have much more resistance and need more pressure to pump through than lungs. Thus they are more muscular.
Because the left side of the heart exerts more pressure in in pumping the blood to the different parts of your body. The more you use your muscles, the more it will get bigger, just like in running the more you use your calf muscles the more it will get bigger.