Your heart is the muscle that pumps blood around the body, and it is located in the left side and centre of the chest cavity. The blood carries oxygen and nutrients to the cells and collects waste products for removal.
The heart consists of specialised muscle and it has two sides, left and right, separated by a wall. Blood coming back from the body tissues (collections of cells) enters the right side of the heart. From there the heart pumps the blood to the lungs where the carbon dioxide is removed and the blood picks up oxygen from the inspired air. The oxygen-rich blood then travels to the left side of the heart and out to the body organs through the aorta, which is the largest artery in the body.