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
○ b
○ c
○ d

Explanation:

• Option A: Skeletal muscles are composed of muscle fibers, along with nerves and blood vessels (for support). Their contraction is the primary mechanism for voluntary body movement.
• 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.
• Option C: Smooth muscles are not made of blood vessels, and they don’t account for all slow - twitch activities (skeletal muscles also have slow - twitch fibers, and smooth muscle function is different, like in organ function).
• Option D: Skeletal muscles are not made of tendons (tendons connect muscles to bones), and they don’t line body cavities (smooth muscles or serous membranes do that).

Answer:

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