Mitochondria, Site of respiration., Cilia, Tiny hairs that move mucus., Alveoli, Site of gas exchange in the lungs., Ventilation, Breathing in and out., Cytoplasm, Where chemical reactions happen., Tar, The sticky substance in cigarettes which coats the linings of the lungs and alveoli. Damages the cilia., Carbon Monoxide, The chemical that joins with red blood cells and stops them carrying oxygen., Nicotine, A highly addictive drug., Oxygen, The gas in the air we breathe in. Carried by red blood cells., Respiration, The process where cells make energy., Diffusion, Particles moving from a high concentration to a low concentration., Digestion, The process by which your body breaks down large, insoluble molecules into smaller soluble molecules.

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