It is important to note that ligaments connect bones to bones and not muscles to bones. With the naked eye, many ligaments can be seen as thick bands that tighten and loosen in different joint positions or as different forces are applied to the joint. The MCL is located on the outside part of the knee. The ACL is located behind the knee and is connected to the tibia and the femur. The final part of the knee is the tendons.
Tendons look almost like ligaments, but they are more cord like and connect the muscles to the bone.
They are made of four different parts. The tendon tightens when a heavy load is picked up, and it loosens when not in use for heavy lifting. The tendon is very stretchable when lifting light loads - small increases in forces result in large changes in length. The magnitude of the force is determined by the mass of the body being acted upon. Next, the normal force is exerted on the body when it comes into contact with the ground.