Smooth muscles are

• A. Voluntary and control movement of limbs
• B. Striated and branched
• C. Involuntary and enable movement of organs
• D. Located in the skull

Answer: (C)

Smooth muscles act without conscious thought, controlled by the autonomic nervous system to move the contents of hollow organs. They are non-striated and arranged in sheets, which lets them contract slowly and sustain movements that push food through the digestive tract, regulate blood flow in vessels, or move urine in the bladder, among other roles. This is different from skeletal muscles, which are voluntary and move the limbs, and from cardiac muscle, which is striated and branched. They’re not located in the skull, where the muscles you can voluntarily move are the skeletal ones of the face and head. So the best description is that smooth muscles are involuntary and enable movement of organs.