Question

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. please select the best answer from the choices provided. ○ a ○ c

Explanation:

• Option A: Skeletal muscles are composed of muscle fibers, nerves, and blood vessels. Their contraction is responsible for voluntary body movements, which matches how the body moves.
• Option B: Cardiac (heart) and smooth (internal organs) muscles are not responsible for all body movement (skeletal muscles handle voluntary movement), and they don't contain cartilage. Eliminate B.
• Option C: Smooth muscles are for involuntary actions (e.g., digestion), not all activities with slow - twitch fibers (slow - twitch is more related to skeletal muscle endurance), and their composition description is incorrect. Eliminate C.
• Option D: Skeletal muscles are attached via tendons but do not line body cavities (that's smooth muscles in some cases), and the description of their function for lining cavities is wrong. Eliminate D.

Answer:

A. Skeletal muscles, which are made of fibers, nerves, and blood vessels, contract in order to make the body move.