Which system includes smooth muscles to facilitate the movement of substances within the body?

• A. Nervous
• B. Skeletal
• C. Muscular
• D. Circulatory

Answer: (C)

The system that includes smooth muscles to facilitate the movement of substances within the body is the muscular system. Smooth muscles are one of the three types of muscle tissue, alongside skeletal and cardiac muscle. Unlike skeletal muscles, which are under voluntary control and involved in movement of the skeleton, smooth muscles are involuntary and are typically found in the walls of hollow organs such as the intestines, blood vessels, and the bladder. These muscles help control the movement of food through the digestive system, regulate blood flow by constricting or dilating blood vessels, and manage other involuntary movements within the body.

While other systems, such as the circulatory system, utilize smooth muscle for specific functions, it is the muscular system that encompasses smooth muscle overall. Therefore, recognizing the role of smooth muscle as a component of the muscular system is essential in understanding how movement of substances occurs within various bodily systems.