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muscle contraction

ability to make a muscle become shorter and thicker

lateral ptergoid

muscle that opens the mouth

206

number of bones in the body

lactic acid

waste product that builds up in the muscle after extensive exercise

sternocliedmastoid

rotates the head to one side if one muscle contracts and other muscles relax

masseter

closes the mouth (mandible)

humerus bone

in the pectorlis major's insertion

muscle fibers

strands of tissue that make up a muscle

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