oxygen - We need this gas to live. We extract it from the air, carbon dioxide - The gas that our cells produce as waste. We need to eliminate it, nose/nasal cavity - The air enters here, trachea - Another name for the windpipe. It connects the nose and mouth to the lungs, bronchi - The trachea divides into two ..., bronchioles - The smallest "branches" of the bronchi, alveoli - Tiny "air sacs" at the ends of the bronchioles, capillaries - These surround the alveoli. They contain the blood, diaphragm - The muscle that contracts and relaxes to control the lungs, inhalation - "Breathing in", exhalation - "Breathing out", ribcage - The bones that protect the lungs,

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