Smooth muscle is found in the walls of hollow internal organs, including all blood vessels except capillaries, the gastrointestinal tract, and the urinary bladder. Smooth muscle is not striated and is not subject to voluntary control.
Smooth muscle is found throughout the body where it serves a variety of functions. It is in the stomach and intestines that it helps with digestion and the collection of nutrients. It is found in the arteries and veins where it plays a vital role in regulating blood pressure and tissue oxygenation. Without these vital functions, the body would not be able to maintain the most basic functions. Smooth muscle can be used by the nervous system to tightly regulate many of the body's subsystems for life without the user even thinking about it. A person does not need to think about their blood pressure to accommodate the increased oxygen demands of exercise.
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