DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Bladder tissue. Light micrograph of a portion of the wall of a human bladder, showing blood vessels (red, injected with a contrast medium) and involuntary muscle (green and yellow). Involuntary muscle (also called smooth muscle) is muscle that contracts without conscious control. It is also found in the walls of the stomach, the intestines, and blood vessels.
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