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11 terms

Respiratory System

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