Lime water, turns from clear to cloudy when carbon dioxide gas is present, wind pipe, airway that takes air from the mouth and nose to the lungs, oxygen, air we breathe in (inhaled air), carbon dioxide, air we breathe out (exhaled air), bronchi, two branches of the wind pipe, bronchioles, tiny branches of the bronchi, air sac/ alveoli, at the end of every bronchiole, ribs, part of the skeleton round the lung, diaphragm, sheet of muscle under the rib cage, mucus, sticky substance in airways that catches germs and dust breathed in, cilia, tiny hairs that move the sticky mucus

The Lungs

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