Which type of muscle is directly involved in human movement and is voluntary?

• A. Skeletal muscle
• B. Smooth muscle
• C. Cardiac muscle
• D. Connective tissue

Answer: (A)

Movement is produced by skeletal muscle, which attaches to bones and is under voluntary control. When you decide to move, the brain sends signals through motor neurons to skeletal muscle fibers. These fibers are striated and organized into sarcomeres, and contraction happens as actin and myosin filaments slide past each other, shortening the muscle. Because the nervous system can actively recruit motor units, skeletal muscle handles deliberate actions like walking, lifting, or throwing. In contrast, smooth muscle operates involuntarily in the walls of hollow organs, cardiac muscle is the heart muscle and also works automatically, and connective tissue isn’t muscle at all. So skeletal muscle is the type directly involved in human movement and under voluntary control.