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Color enhanced scanning electron micrograph (SEM) of red blood cells found enmeshed in a fibrinous matrix on the luminal surface of an indwelling vascular catheter; Magnified 7766x. In this instance, the indwelling catheter was a tube that was left in place creating a patent portal directly into a blood vessel. The cell in the centre was a white blood cell, also known as a leucocyte. The biconcave cytomorphologic shape of the red blood cell, or erythrocyte, increases its surface area of this hemoglobin-filled cell, thereby, promoting a greater degree of gas exchange, which is its primary function in an in vivo setting. In their adult phase, these cells possess no nucleus. What appears to be irregularly-shaped chunks of debris, are actually fibrin.
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