SAT Subject Biology Practice Question 190: Answer and Explanation

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Question: 190

20. Which muscle type lines the interior walls of hollow organs?

I. Cardiac

II. Smooth

III. Striated

A. I only
B. II only
C. III only
D. I and II
E. II and III

Correct Answer: B


Smooth muscle, which is not under voluntary control, lines the interior walls of organs such as the stomach, intestines, and blood vessels.

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