Which muscle type is found in the walls of internal organs and is non-striated?

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

Answer: (B)

Think about where smooth, continuous movements are needed inside the body. The walls of internal organs like the stomach, intestines, blood vessels, bladder, and uterus are lined with smooth muscle. This type of muscle is non-striated, so it doesn’t show the striped pattern you see in other muscles. It’s also involuntary, meaning it works without conscious control, powered by the autonomic nervous system. Its fibers are arranged to produce slow, sustained contractions that help with peristalsis, moving contents through organs, and with regulating the diameter of vessels and ducts.

This is different from skeletal muscle, which is striated and under voluntary control, and from cardiac muscle, which is striated but confined to the heart.