SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Bronchial tree. The branching bronchi (the airways of the lungs) make up what is known as the bronchial tree. Also seen in the chest is the heart (upper centre), and the sternum (upper centre) and the backbone (lower centre), connected by the ribs. This inferior view looks up the body from below, with the front of the body at top.
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