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The human lungs are a pair of large, spongy organs optimized for gas exchange between our blood and the air. The red blood cells are responsible for picking up the oxygen in the lungs and carrying the oxygen to all the body cells that need it. The red blood cells drop off the oxygen to the body cells, then pick up the carbon dioxide which is a waste gas product produced by our cells. The red blood cells transport the carbon dioxide back to the lungs and we breathe it out when we exhale. Breathing is controlled by your Autonomic Nervous System. If you are breathing properly you will inhale and exhale anywhere from 15 to 25 times per minute.