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50.7 MB (3.3 MB compressed)
3543 x 5003 pixels
30.0 x 42.4 cm ⏐ 11.8 x 16.7 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
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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