tell me the passage of air?
asked by madhuri (student)
When we inhale, air enters the body through the nose. The air flows from the nostrils to the nasal passages. The nasal passages are lined with tiny hairlike structures and a sticky substance called mucus. These structures and the mucus filter dust and dirt from the air. In addition, cold air is warmed and moistened as it moves through the nasal passages. From the nose, the air passes through the pharynx (the cavity behind the nose and mouth) and the larynx (the voice box). The air then enters the trachea.
hello madhuri... The trachea carries the air toward the lungs. Before reaching the lungs, the trachea splits into two tubes called the primary bronchi. Each tube enters one lung. Within the lungs, the primary bronchi divide into smaller and smaller tubes, finally branching into extremely tiny tubes called bronchioles. The bronchioles end in hundreds of millions of thin-walled structures called alveoli or air sacs. The alveoli give the lungs a tremendously extended surface area. If the air sacs were flattened out, the lungs would cover from 55 to 90 square metres.
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