Multiple choice

Which of the following organs are composed of involuntary muscle fibres?

  1. Uterus

  2. Iris of the eye

  3. Bronchi of the lungs

  4. Moving food along the oesophagus

  5. All of the above
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Smooth muscles or the involuntary muscles are the spindle shaped striated muscle fibres found in the iris of the eye, uterus and bronchi of the lungs. Smooth muscle fibres control the involuntary movement in these organs.

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