STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Red blood cells, coloured scanning electron micrograph (SEM). Slight crenation (wrinkling) around the cell edges is shown due to exposure to a hypertonic solution causing loss of water through osmosis. The main function of red blood cells (erythrocytes) is to distribute oxygen to body tissues, and to carry waste carbon dioxide back to the lungs. Red blood cells are biconcave, giving them a large surface area for gas exchange, and highly elastic, enabling them to pass through narrow capillary vessels. Magnification: x1000 when printed at 10 centimetres wide.
Model release not required. Property release not required.