Why is left ventricles of the heart has a thicker muscles than the right ventricles?
Answer:
Most of these answers are pretty close, but it's a little more involved than that. Indeed, the left side of the heart is thicker because it has to pump blood against a greater resistance (the "peripheral circulation," or the body tissues) and the right side less thick because it pumps against a lesser resistance (the "pulmonary circulation," or the lungs), but (assuming no major heart or lung disease) these volumes of blood are exactly the same...so the left isn't pumping any more blood than the right, it's just pumping against more resistance. As you probably know, the heart muscle grows to keep up with the increased workload on the left side of the heart...it's like the left side is a weightlifter.
The right ventricle pumps blood to the lungs located right next to the heart. Left ventricle pumps to the Aorta, which supplies blood to the rest of the body. The force has to be greater, thus the thicker muscle.
The Left ventricle has a thicker wall because it has to overcome a higher force of pressure to pump blood to the entire body where as the right ventricle just has to pump blood into the lungs.
This is a guess here, but I think it is thicker because there is more pressure in this particular part of the heart - that is why we feel the heart on the left, because there is more pressure and more strength in the left part of the heart, and the "power stroke" is in the left ventricle.
Check out the wikipedia entry too:
http://en.wikipedia.org/wiki/human_heart...
The left heat has to pump blood throughout the body, while the right heart pumps blood only through the lungs.
The pressures required to pump blood through the systemic circulation are much higher than the pulmonary circulation. More work means a bigger muscle.
People with chronically high blood pressure can get a left ventricular muscle so thick that it outstrips its blood supply.
The left side is a high-pressure system that has to do a lot of work. It's a long way to the toes. The right side is a low-pressure system that only has to pump to the immediate neighborhood. Take a look at your average pressures in the left and right ventricles.
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