K H FUNG / SCIENCE PHOTO LIBRARY K H FUNG / SCIENCE PHOTO LIBRARY
Heart and lung bronchioles, 3D coloured frontal computed tomography (CT) scan. The heart (centre) is a hollow muscular organ that receives and pumps blood from and around the body. This scan includes the lung airways (bronchioles, blue), as well as the lung blood vessels, the heart's major veins and arteries, and part of the thoracic spine (behind heart).
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