Muscles are ____ body parts that cause the movement of bones., hard, soft, sharp, The human body can move as a result of ___ and ___ of muscles., bending and stretching, contraction and relaxation, pulling and pushing, : When a muscle contracts, it becomes ____., shorter and harder, longer and softer, larger and weaker, When bending the arm, the inner muscle at the top becomes ____., relaxed, contracted, longer, When extending (stretching) the arm, the outer muscle at the bottom becomes ____., contracted, relaxed, softer, The part where the arm bends and helps muscles move the bones is called a ____., muscle, skin, joint

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