Blood cells,SEM

Bildnummer 11633936
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 cell's 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 body's immune system. They perform functions ranging from cleaning up cellular debris,to defending the body against bacteria and other pathogens
Lizenzart: Lizenzpflichtig
Credit: Science Photo Library / Nishinaga, Susumu
Bildgröße: 4573 px × 3849 px
Modell-Rechte: nicht erforderlich
Eigentums-Rechte: nicht erforderlich
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