PROF S. CINTI / SCIENCE PHOTO LIBRARY PROF S. CINTI / SCIENCE PHOTO LIBRARY
Capillary and red blood cell, coloured transmission electron micrograph (TEM). This cross-section shows a single red blood cell almost filling the lumen of the capillary. Capillaries are the smallest blood vessels, only a few micrometres across, just large enough for the passage of red blood cells. The capillary lining consists of endothelial cells. Red blood cells carry oxygen to body tissues and carry away carbon dioxide (the waste product of respiration).
Model release not required. Property release not required.