Which statement best describes how the body moves?
a. skeletal muscles, which are made of fibers, nerves, and blood vessels, contract in order to make the body move.
b. cardiac and smooth muscles are made of muscle fibers, nerves, and cartilage and are responsible for all movement in the body.
c. smooth muscles, which are made of blood vessels, fibers, and nerves, allow for all activities that use slow-twitch muscle fibers.
d. skeletal muscles, which are made of tendons, nerves, and fibers, line the body cavities and allow for support and movement.