Because it is the central organ of the body, like a nucleous, it helps with the functions of the brain by pumping blood to your body allowing them to recieve oxygen, then helps your body to move.
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The heart is slightly to the left because the left side of the heart is bigger. This is because blood pumped from the left side of the heart has to circulate to the organs and requires the left ventricle to have enough power to get it there whereas the right side pumps simply through the lungs and back to the left
the heart is actually in the middle of your body. the left side of your heart is just stronger because it is the side that pumps your blood throughout your body. That is why your heart feels like it is on the left side of your body.
It's not it is in the middle of the thorax between the two lungs!
Interestingly enough, it is actually in the middle in an area called the mediastinum. The reason that some people describe it as being on the left side is because the left side is bigger, and so it appears to be more on the left side. As far as the structures that contain the heart, the blood vessels and pericardium, it is truly indeed in the middle.
Because that's where it is. There isn't any deep meaning to it. (Incidentally, it's not really on the left side... it's in the middle, just slightly left of center.)