K H FUNG / SCIENCE PHOTO LIBRARY K H FUNG / SCIENCE PHOTO LIBRARY
Human heart and lung bronchioles, 3D coloured computed tomography (CT) scan. The heart (centre) is seen from below. The heart 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, and the heart's major veins and arteries.
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