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Which of the following is not exclusively supplied with involuntary muscles?

1. Muscular coats of blood vessels
2. Muscles of the ducts of glands
3. Muscles of iris
4. Muscles of urethra

Correct answer: Muscles of urethra

Solution

The muscular coats of blood vessels, gland ducts, and the iris are made of involuntary smooth muscle. The urethra is not exclusively supplied by involuntary muscle because its sphincter region includes voluntary control.

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