SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Trachea. Coloured scanning electron micrograph (SEM) of the exterior of the trachea (windpipe). The trachea links the larynx (voice box) to the lungs. The trachea is reinforced with cartilage rings, which help to keep the airway permanently open. Many blood vessels (yellow) cover the surface of the trachea.
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