What are the tiny sacs within our lungs that allow oxygen and carbon dioxide to move between the lungs and bloodstream called?

Keep practicing — related questions

• Bronchus divides the lungs to form a large number of smaller tubes called ________.
• The bronchioles end in air sacs called _____.
• The air passage that leads to the lung is called ______.
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• Bronchus divides in the lungs to form a large number of smaller tubes called
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• Which scientist discovered carbon dioxide first, in 1630?
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