Question. Each cell in your body needs oxygen to live. The air that we breathe contains oxygen and gases. Once in the lungs, oxygen is ______ to the bloodstream and carried through your body. Oxygen is exchanged for waste gas called carbon dioxide at each cell in your body. Your bloodstream then brings this gas back to the lungs, where it is ______ from the blood stream and then exhaled. Your lungs and respiratory system ______ perform this vital process, called gas exchange. The capacity of the lungs decreases as you age. Keep your lungs healthy every day. Eat a balanced diet, exercise, and reduce ______.
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