In the body's lever systems, the fulcrums are represented by the

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Joints serve as fulcrums in the body's lever systems. A joint is where two or more bones come together and allow movement. When muscles contract and apply force to the bones around a joint, the joint serves as the fixed point (fulcrum) for the lever system to produce movement.

B, C, D, and E are not correct because although they are all involved in the body's lever systems in some way, they do not serve as fulcrums. Long bones, for example, serve as levers themselves, while tendons and skeletal muscles provide the force that produces movement in the lever system. Short bones also play a role in the lever system, particularly in the foot and hand, but they are not specifically fulcrums in the way that joints are.

In the Body's Lever Systems, the Fulcrums Are Represented by the