A joint is where two or more bones come together and move using muscles. So a joint could be called a pivot point.
pivot point or fulcrum are the joints in the muscle.
pivot
Your bones are solid and fixed - they cannot move by themselves because they have no flexibility. Your muscles are used to move your bones because each muscle can contract or relax - get shorter or longer - and therefore cause the bones to move.
Muscles can move bones because they can reduce their length in response to a stimulus, which comes from the nervous system. Skeletal muscles, the ones attached to the bones to make them move, have two ends: an origin and an insertion. These ends are each connected to different bones and these bones are connected to each other by a joint. The two bones and the muscle can be seen to form a triangle, with the bones making up two of the three sides, and the muscle the third. answer is correct, this is a shorter version, muscle connects 2 bones, the muscle fibers contract to shorten and pull the bones closer together.
Muscle is connected to bone with tendons, bones are attached with ligaments and separated by cartilage to keep bones from grinding on each other.
in shoulder joint
Tendons connect muscle to muscle and also muscle to bone.
What happens to the bones when muscle shortening
Skeletal muscle tissue is striated muscle tissue connected to bones.
Muscle
when a muscle contracts or shortens the attached bones are pulled closer to each other
ligaments attach bone to bone and tendons attach bone to muscle