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From Science Focus 2.

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

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