Digitised colour SEM of red blood cells

Digitised colour SEM of red blood cells

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Credit: ROBERT BECKER, CUSTOM MEDICAL STOCK PHOTO/ SCIENCE PHOTO LIBRARY

Caption: Red blood cells. Digitised coloured scanning electron micrograph (SEM) of human red blood cells (erythrocytes). 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. The nucleus and other organelles are lost as the cell matures. Each cell's interior is packed with haemoglobin, a red iron-containing pigment which has an efficient oxygen carrying capacity. The main function of red blood cells is to distribute oxygen to body tissues and to carry the waste gas carbon dioxide back to the lungs. Magnification unknown.

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Keywords: anatomy, blood cell, cells, digitised, erythrocyte, human body, red, red blood cell

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