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CHAPTER 15 - LIVER AND GALLBLADDER
Histology Guide
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MICROGRAPH

NAME
EM 083 Gallbladder
TISSUE
Dog Gallbladder
IMAGE SIZE
10,738 x 8,955 pixels
367 MB
FILE SIZES
71,149 KB (grayscale)
74,506 KB (color)
MAGNIFICATION
Unknown
PIXEL SIZE
3.138 nm
SOURCE
Stanley L. Erlandsen
Department of Genetics, Cell Biology and Development
School of Medicine
University of Minnesota
Minneapolis, MN

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University of Minnesota
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EM 083 Gallbladder

Gallbladder

Transmission electron micrograph (TEM) of the simple columnar epithelium (inactive) that lines the interior of the gallbladder.

During the storage of bile in the gallbladder, it is concentrated by the reabsorption of water by the transport of sodium ions out of the lumen. The high concentration of sodium ions forms and osmotic gradient that causes water to diffuse across the epithelium.

  • Microvilli - cover the apical surface of the cells
  • (blue)
  • (yellow) - poorly developed, adjacent to the nuclei
  • Mitochondria (,) - numerous to provide energy for the transport of sodium ions
  • Endoplasmic Reticulum (cyan)
  • Cytoplasm (green)

The structure of the epithelium changes when the cells are actively pumping sodium ions (see EM 083 Gallbladder).

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