its muscles and joints
With regards to movement and support to the body, a broken bone will reduce the ability of the bone to support the weight of the body. A bone acts as a frame for the muscle to pull against and thus enable movement. The muscle is unable to pull against a broken bone and therefore movement is reduced or not possible at all.
That cracking sound is the result of crepitus, which is the result of bone on bone movement or bone on ligament movement.
bone twisting when a torque is applied from a muscle or when in response to another bone movement
yes
to enable them have free movement in their surrounding environment
Flagellum or Flagella
ligaments connect bone to bone and help stabilize the joints. tendons connect muscle to bone which enable us to move.
agonist
Aids in movement of joints without pain, otherwise the movement would be bone on bone and could be very painful.
The flagella protrude from cell's surface and enable movement of the cell. Many single celled eukaryotes use flagella for movement.
Tendons attach muscle to bone.
a choad