Diffusion, The movement of gases from an area of high concentration to an area of low concentration, Alveoli, Part of the lungs where gas exchange takes place, Capillaries, Small blood vessels that surround alveoli, Bronchi, The branches of the trachea that contain cartilage and split into the left & right lungs, Trachea, The 'windpipe' - tube that joins the mouth with the lungs.

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