Question

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 B: Cardiac and smooth muscles do not contain cartilage, so B is incorrect.
• Option C: Smooth muscles are not made of blood vessels, and the description of their function is inaccurate, so C is incorrect.
• Option D: Skeletal muscles do not line body cavities (that's smooth muscle), and their composition description is wrong (they have tendons but also other components like blood vessels, and the main function description is off), so D is incorrect.
• Option A: Skeletal muscles are made of muscle fibers, along with nerves and blood vessels, and their main function is to contract for body movement, which is correct.

Answer:

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