Healthy heart and lungs. Coloured frontal chest X- ray showing a healthy heart (blue, lower centre) and lungs (red/yellow). The heart is a hollow, muscular organ responsible for pumping blood around the body. The blood picks up oxygen from the lungs before returning to the heart to be sent to the rest of the body. These organs are protected by the ribs (horizontal bands) and the sternum (green/blue). Below the heart and lungs is the diaphragm (white), a muscular sheet that contracts and expands, pulling and pushing air in and out of the lungs.
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