Transmission electron micrograph (TEM) of the endothelial lining of a blood capillary. Endothelial cells, resting on a basement membrane, show marginal folds of cytoplasm that project into the lumen, covering intercellular junctions.

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Photo credit: © JOSE CALVO / SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: -, biological, biology, black, blood, capillary, cell, cytological, cytology, electron, endothelial, endothelium, fold, healthy, histological, histology, marginal, micrograph, microscope, microscopy, monochrome, normal, pinocytic, pinocytosis, tem, transmission, ultrastructure, vesicle, vessels, white