Which muscle tissue is involuntary and located in the walls of internal organs?

• A. Skeletal muscle
• B. Smooth muscle
• C. Cardiac muscle
• D. Striated muscle

Answer: (B)

Muscle tissues differ in how they’re controlled and where they’re found. Smooth muscle is involuntary, meaning you don’t consciously control it, and it lines the walls of many internal organs and blood vessels. This combination fits the description of being inside the body and not under conscious control, which is why it’s the correct choice. Skeletal muscle is voluntary and moves the bones; cardiac muscle is involuntary but confined to the heart; striated describes the appearance of certain muscles (including skeletal and cardiac) rather than a separate type, so it doesn’t match the specific location and control described.