Which muscles are involuntary or smooth muscles?

• A. Non-striated
• B. Muscular Tissue
• C. Nerve tissue
• D. Clean

Answer: (A)

Smooth muscle, which is involuntary, is non-striated in appearance. These muscles form the walls of hollow organs and blood vessels, and their contractions happen automatically under the autonomic nervous system rather than by conscious control. The lack of visible stripes under a microscope gives them the non-striated look, distinguishing them from skeletal muscle, which is striated and voluntary, and from cardiac muscle, which is also striated but involuntary. So the term that best describes involuntary or smooth muscle is non-striated. The other options don’t fit because they describe a broad category (muscular tissue), a different tissue type (nerve tissue), or something unrelated (clean).