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From Science Focus 2.
Site of gas exchange in the lungs
Movement of gases from high concentration to low concentration
Another name for the trachea
Prevents food from entering the trachea
Oxygen-carrying molecule in red blood cells
Air which is breathed out
Air moves from the lungs and into these vessels
Carries water and nutrients around the body
The muscle that pumps blood all around the body
Vessels that carry blood back to the heart
Vessels that carry blood away from the heart