Which parts of your body's act like simple machines?

Several parts of the body function like simple machines. For instance, the lever system is exemplified by the bones and muscles, where the bones act as levers and the joints serve as fulcrums, facilitating movement. The knee functions as a first-class lever, while the elbow operates as a third-class lever. Additionally, the pulley system can be seen in the tendons that pull on bones, enabling efficient movement and force application.