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Which one of the following is correct pairing of a body part and the kind of muscle tissue that moves it?

1. Biceps of upper arm–Smooth muscle fibres
2. Abdominal wall–Smooth muscle
3. Iris–Involuntary smooth muscle
4. Heart wall–Involuntary unstriated muscle

Correct answer: Iris–Involuntary smooth muscle

Solution

The iris is controlled by smooth muscle, which works involuntarily to change pupil size. The other options are mismatched: biceps and abdominal wall are skeletal muscles, and the heart wall is cardiac muscle, not unstriated smooth muscle.

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