The 'right' side of the heart pumps deoxygenated blood out of the pulmonary artory to the lung capillaries to be oxygenated, which then after oxygenation travels down the pulmonary vein into the...
The heart is on the left side because that way the veins and the arteries go around the organs more freely. ''easier'' organ (the stomach) is on the left side, and the liver is on the right. You...