MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Smooth muscle of bladder. Light micrograph of smooth (visceral) muscle fibres of the bladder wall. The bladder is the sac-shaped organ that stores the urine. Here, the smooth muscle fibres can be seen as long, thin cells, each with a centrally located nucleus (purple dot). The bladder wall has three layers of smooth muscle which intermingle so can not be separated clearly. The fibres here can be seen to be arranged obliquely and intersect with one another. Smooth muscle is also called involuntary muscle. This is because it produces slow long term contractions of which the individual is unaware. Haematoxylin stained. Magnification: unknown.
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