Healthy lung airways. Computer artwork showing the internal anatomy of the airways of a human lung. At top right, the trachea (or windpipe) is seen. Air travels through the trachea into the two branching bronchi (at top right) and into each lung. The bronchi are then seen to divide and branch into smaller & finer bronchioles. These end in microscopic alveoli (not seen) where the exchange of gases takes place. Inhaled oxygen enters the blood and carbon-dioxide is breathed out. For this respiration process, the lungs are inflated and deflated by movement of the diaphragm and ribs.
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