It is pumped into the left lower chamber (ventricle) and then into the aorta (an artery). The left side of the heartThe oxygenated blood travels back to the heart, this time entering the left upper chamber (atrium). The blood is squeezed down into the right lower chamber (ventricle) and taken by an artery to the lungs where the carbon dioxide is replaced with oxygen. The right side of the heartThe right upper chamber (atrium) takes in deoxygenated blood that is loaded with carbon dioxide. The contractions of the chambers make the sound of heartbeats. The heart is actually a double pump made up of four chambers, with the flow of blood going in one direction due to the presence of the heart valves. It sits inside the chest, in front of the lungs and slightly to the left side. The heartThe heart pumps blood around the body.
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