What do tendons primarily do in the body?

Tendons play a crucial role in the musculoskeletal system by attaching muscle to bone. This connection allows muscles to exert force on bones, which leads to movement. When a muscle contracts, it pulls on the tendon, thereby transmitting the force to the bone, resulting in motion at a joint. This mechanism is essential for all voluntary movements, from walking to complex athletic activities.

In contrast, ligaments, which are often confused with tendons, connect bone to bone and help stabilize joints. The function of protecting blood-producing cells is associated with bone marrow within the bones, rather than tendons. Lastly, while tendons contribute to joint stability by controlling the movement of the bones they connect to, their primary function is to facilitate movement by linking muscles to bones.