The correct answer is option 3, that is, the muscular system, to extend, flex, and rotate the muscles with smooth, and coordinated effort.
The musculoskeletal system provides support, form, movement, and stability to the body. It comprises the bone of the skeleton, cartilage, muscles, ligaments, tendons, joints, and other connective tissue, which holds and supports organs and tissues together.
The flexing, extension, and rotation of the muscles with smooth and coordinated effort makes sure the movement of fluid in the human body.
Answer-
C: The muscular system, to flex, extend, and rotate the muscles with smooth, coordinated effort.
