Trachea and bronchi of the lungs

Trachea and bronchi of the lungs

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Credit: SCIENCE PHOTO LIBRARY

Caption: Resin cast of the adult human lower trachea & bronchial tree. The bronchi have been coloured orange & their main branches in a range of colours in order to separate them. The bronchial tree conducts air to & from the lungs through a system of tubes. These tubes become increasingly smaller as they get deeper into the lungs, finally culminating in alveolar sacs. It is across these thin-walled sacs that gaseous exchange takes place; oxygen passing to the blood & carbon dioxide into the lungs for expiration.

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Keywords: airways, anatomy, bronchi, bronchial tree, healthy, human body, lungs, normal, resin cast, respiratory system, trachea, windpipe

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