Respiratory System

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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

Exhaled air

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

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