Musculoskeletal system
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The musculoskeletal system is an organ system that gives animals the ability to move by using the muscles and skeletal system to engage in locomotion. Bones also serve a role as support and to protect internal organs and in many organisms to store fat and minerals and produce blood cells.
The human musculoskeletal system consist of the human skeleton, made by bones attached to other bones with joints, and skeletal muscle attached to the skeleton by tendons.
Among others, cnidarians and annelids, have a hydrostatic skeletons that is similar to a water-filled balloon, these animals can move by contracting the muscles surrounding the fluid-filled pouch, creating pressure within the pouch that causes movement. Animals such as earthworms use their hydrostatic skeletons to change their body shape as they move forward. from long and skinny to short and stumpy. Arthropoda have their muscles attached to an exoskeleton.