<P> A tendon is a tough, flexible band of fibrous connective tissue that connects muscles to bones . The extra-cellular connective tissue between muscle fibers binds to tendons at the distal and proximal ends, and the tendon binds to the periosteum of individual bones at the muscle's origin and insertion . As muscles contract, tendons transmit the forces to the relatively rigid bones, pulling on them and causing movement . Tendons can stretch substantially, allowing them to function as springs during locomotion, thereby saving energy . </P> <P> Joints are structures that connect individual bones and may allow bones to move against each other to cause movement . There are two divisions of joints, diarthroses which allow extensive mobility between two or more articular heads, and false joints or synarthroses, joints that are immovable, that allow little or no movement and are predominantly fibrous . Synovial joints, joints that are not directly joined, are lubricated by a solution called synovial fluid that is produced by the synovial membranes . This fluid lowers the friction between the articular surfaces and is kept within an articular capsule, binding the joint with its taut tissue . </P> <P> A ligament is a small band of dense, white, fibrous elastic tissue . Ligaments connect the ends of bones together in order to form a joint . Most ligaments limit dislocation, or prevent certain movements that may cause breaks . Since they are only elastic they increasingly lengthen when under pressure . When this occurs the ligament may be susceptible to break resulting in an unstable joint . </P> <P> Ligaments may also restrict some actions: movements such as hyper extension and hyper flexion are restricted by ligaments to an extent . Also ligaments prevent certain directional movement . </P>

How does respiratory system work with skeletal system