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BioFlix: Mechanics of Breathing

by Pearson
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Whether you're racing in a triathlon or doing something less strenuous, you need to breathe in oxygen to help you get energy and breathe out carbon dioxide, a waste product. When you inhale, your diaphragm and rib muscles contract, increasing the volume of your lungs. When you exhale, these muscles relax, decreasing the volume of the lungs. When the lungs expand, air pressure in the lungs drops, causing air to flow into the lungs. When lung volume decreases, air pressure increases, causing air to flow out of the lungs.
Whether you're racing in a triathlon or doing something less strenuous, you need to breathe in oxygen to help you get energy and breathe out carbon dioxide, a waste product. When you inhale, your diaphragm and rib muscles contract, increasing the volume of your lungs. When you exhale, these muscles relax, decreasing the volume of the lungs. When the lungs expand, air pressure in the lungs drops, causing air to flow into the lungs. When lung volume decreases, air pressure increases, causing air to flow out of the lungs.