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As you inhale air, it travels down the windpipe, known scientifically as the trachea. Once through the trachea, the air divides and goes into two tubes, each called a bronchus (plural bronchi). The right bronchus brings air into the right lung, the left bronchus brings air to the left lung. Inside each lung there are bronchioles, which are tubes (smaller than that of the bronchi) which bring air to little air sacs called alveoli, where gas exchange occurs within capillaries.

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