Blood cells, SEM

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Blood cells, SEM

Blood cells. Coloured scanning electron micrograph (SEM) of human red blood cells (erythrocytes) and a white blood cell (leucocyte, pink). 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 cells mature. The cells interior is packed with haemoglobin, a red iron-containing pigment that has an oxygen-carrying capacity. The main function of red blood cells is to distribute oxygen to body tissues and to carry waste carbon dioxide back to the lungs. White blood cells are part of the bodys immune system. They perform functions ranging from cleaning up cellular debris, to defending the body against bacteria and other pathogens

Science Photo Library features Science and Medical images including photos and illustrations

Media ID 9219365

© SUSUMU NISHINAGA/SCIENCE PHOTO LIBRARY

Biconcave Blood Disc Shaped Erythrocyte Erythrocytes Haematological Haematology Haemoglobin Hematology Hemoglobin Immune Cell Immune System Immunity Leucocyte Leukocyte Oxygen Carrying Rbcs Red Blood Cell Red Blood Cells White Blood Cell Cells Circulation Circulatory System

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