An example of a non-striated involuntary muscle is which?

An example of a non-striated involuntary muscle is which?

• A. Arm muscle
• B. Forehead muscle
• C. Corrugated muscle
• D. Stomach muscle

Answer: (D)

Non-striated involuntary muscles are smooth muscles that work without conscious control. The stomach wall is lined with smooth muscle, which contracts automatically to churn and propel contents (peristalsis). In contrast, arm and forehead muscles are skeletal, showing visible striations and are under voluntary control. Corrugated muscle isn’t a standard category for muscle type, so it doesn’t describe smooth, involuntary tissue. Therefore, the stomach muscle best fits the description.

Non-striated involuntary muscles are smooth muscles that work without conscious control. The stomach wall is lined with smooth muscle, which contracts automatically to churn and propel contents (peristalsis). In contrast, arm and forehead muscles are skeletal, showing visible striations and are under voluntary control. Corrugated muscle isn’t a standard category for muscle type, so it doesn’t describe smooth, involuntary tissue. Therefore, the stomach muscle best fits the description.