BSIP DUCLOUX / SCIENCE PHOTO LIBRARY BSIP DUCLOUX / SCIENCE PHOTO LIBRARY
Human heart. Coloured Magnetic Resonance Imaging (MRI) scan of an axial (horizontal) section through the chest, showing a healthy heart. The heart (red and yellow, at upper centre) is at right as the body is being viewed from below. The visible chambers of the heart are, clockwise from left: the right atrium, the right ventricle and the left ventricle. The spinal cord (yellow, at bottom centre) is surrounded by a vertebrae (blue), while the ribcage circles the whole scan (blue). The descending aorta (yellow) is below the heart. At left and right are the lung's lobes (purple and yellow at left; yellow at right). The lobe at right is indented by the heart.
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