Which type of muscle is not under conscious control?

• A. Voluntary muscle
• B. Involuntary muscle
• C. Skeletal muscle
• D. Cardiac muscle

Answer: (B)

Not under conscious control means the muscle acts automatically, without you deciding to move it. Voluntary muscles are the skeletal muscles you choose to move, so they are under conscious control. Involuntary muscles operate automatically, controlled by the autonomic nervous system; this group includes smooth muscle in organs and the heart. The broader category “involuntary muscle” fits the question because it describes the general type that cannot be consciously controlled, while skeletal muscle is clearly voluntary, and cardiac muscle is a specific example of an involuntary muscle. Think of how the heart keeps beating and the gut moves food along—these actions happen without you thinking about them, illustrating involuntary muscle activity.