Final answer:
Muscles contract and relax to produce movement in the body by pulling on the bones they are attached to.
Step-by-step explanation:
Muscles play a crucial role in producing movement in the body. When muscles contract, they become shorter and thicker, pulling on the bones they are attached to. This contraction allows for the movement of different body parts. For example, when the biceps muscle contracts, it pulls on the forearm bones, resulting in the movement of the arm.
Learn more about Movement in the body