Red blood cells and platelets, SEM

Red blood cells and platelets, SEM

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Caption: Human red blood cells and platelets, coloured scanning electron micrograph (SEM). Human red blood cells (RBCs), or erythrocytes, are involved in delivering oxygen to the body tissue. The cytoplasm of RBCs is rich in haemoglobin, an iron-containing biomolecule that can bind oxygen and is responsible for the red color of the cells. In humans, mature RBCs are flexible and oval biconcave disks. Platelets are blood cell fragments that play an essential role in blood clotting and wound repair. Platelets in the blood are small oval disks and are termed non-activated platelets or thrombocytes. They are the body's first line of defence against excessive blood loss. When an injury such as a cut is sustained, platelets (now known as activated platelets) change their shape, become sticky and build up on a vessel wall to form a plug. Magnification: x1,245 when shortest axis printed at 25 millimetres.

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Keywords: 9031a, blood, blood cell, blood cells, circulatory system, colored, coloured, erythrocyte, erythrocytes, false-colored, false-coloured, haemoglobin, human, human blood, human blood cell, human blood cells, human body, leukocyte, leukocytes, medical, platelet, platelets, red blood cell, red blood cells, scanning electron micrograph, sem, thrombocyte, thrombocytes

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