Lungs

Without conscious effort, you breathe in and out 10 to 15 times each minute. When you are at rest and breathe normally, each breath lasts about 4 to 6 seconds and moves approximately 1.5 pints of air. During vigorous physical exertion you may take in as many as 5 or 6 pints of air per breath.

The Respiratory System

The air you breathe passes through your trachea (windpipe), which divides into two smaller tubes called bronchial tubes, each of which leads to one of the lungs.The bronchial tubes branch into smaller and smaller tubes called bronchioles.At the ends of the bronchioles are tiny clusters of air sacs called alveoli (inset), where oxygen is absorbed „..,„. into the bloodstream and carbon dioxide is eliminated from the bloodstream.

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