Smooth muscle is a kind of tissue that is present in the walls of hollow organs like the stomach, uterus, and intestines. Additionally, smooth muscle is present in the walls of arteries and veins in the cardiovascular system. The urinary, pulmonary, and reproductive tracts all contain this kind of involuntary non-striated muscle. Additionally, smooth muscle can be found in the eyes, where it alters the shape and size of the lens and iris. Additionally, the skin has smooth muscle, which enables hair to stand up in response to cold or fear.
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