Breathing — Introduction to Respiration and Gas Exchange + 7 more topics

When you inhale, air travels down your windpipe (trachea), into your bronchial tubes, and finally reaches tiny air sacs called alveoli in your lungs. These alveoli are incredibly thin-walled, like tiny balloons, and are surrounded by even tinier blood vessels called capillaries. This is where the magic of gas exchange happens.

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