veins, thin muscle, arteries, thick muscle, vena cava [what side of the heart], right side of the heart, aorta [what side of the heart], left side of the heart, aerobic resperation, uses oxygen, unit of force, newtons, force=, mass x accelaration, what does friction do, slows down motion, accelerate=, change in speed, one affect of smoking, lungs weaken.

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