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(A) The iris of the eye contains involuntary smooth muscles that control the size of the pupil. $A$ is correct because the iris is composed of smooth

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Iris - Involuntary smooth muscle

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(A) The iris of the eye contains involuntary smooth muscles that control the size of the pupil. $A$ is correct because the iris is composed of smooth muscles which are involuntary. $B$ is incorrect because the heart wall is composed of cardiac muscles,which are striated and involuntary. $C$ is incorrect because the upper arm (biceps/triceps) is composed of skeletal muscles,which are voluntary and striated. $D$ is incorrect because the abdominal wall is primarily composed of skeletal muscles,which are voluntary.

Which of the following represents the correct matching of a body part and the muscle associated with its movement?

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