Question

Which of the following organs contain(s) smooth muscles?

• A. Blood vessels
• B. Iris of the eye
• C. Bronchi
• D. All of the above

Answer 1

The correct option is D All of the above

Smooth muscles are spindle-shaped and are under involuntary control. They are seen in the internal organs such as the blood vessels, iris and the lung bronchi. In the blood vessels, they enable the blood flow. In iris, they increase the pupil size in the presence of bright light. They help in lung contraction and relaxation due to their presence in bronchioles. Thus the correct answer is option D.