Question

How do muscles, bones, joints, tendons and ligaments would work together to bend the knee and move the lower part of the leg backwards?

Answer 1

See below.

Explanation:

Your bones serve as a framework for muscles to be attached to. When your muscles contract, the bones are brought along with them because they are connected by tendons. Joints (in your knee, a hinge joint) allow the smooth movement of bone along with the muscle. Ligaments connect bones to bones, thus making the femur connected to the lower leg. These ligaments will stretch when the bones move.