Which of the following lists all three muscle types found in the human body?

• A. Skeletal
• B. Cardiac
• C. Smooth
• D. Skeletal, Cardiac, and Smooth

Answer: (D)

The three muscle tissue types in the human body are skeletal, cardiac, and smooth. A complete list must include all three because each type has a distinct role: skeletal muscle attaches to bones and enables voluntary movement; cardiac muscle forms the heart and contracts automatically to pump blood; smooth muscle lines the walls of hollow organs and blood vessels, controlling movement and flow involuntarily. Any option that leaves out one of these types misses a fundamental category of muscle tissue, so the only full and correct set is skeletal, cardiac, and smooth.