Basic Histology -- A Capillary Next Home Back

Capillaries are tubes of endothelium, freely permeable to molecules smaller than albumin.

Endothelial cells, in three dimensions, look like fried eggs, sunny-side up. The nucleus would be the yolk. Now think of a long lines of fried eggs, cooked close enough so that their edges meet on the right and left. Roll the line of fried eggs into a tube, and you have a capillary.

This is a section of brain showing capillaries.

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Kansas City University of Medicine and Biosciences