Human red and white blood cells, SEM

Human red and white blood cells, SEM

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Caption: Human red blood cells, activated platelets and white blood cells - monocyte and T lymphocyte, coloured scanning electron micrograph (SEM). Red blood cells (RBCs), or erythrocytes, are involved in delivering oxygen to the body tissue. Monocytes are a type of white blood cell (leukocyte).They are part of the innate immune system of vertebrates. Lymphocytes (leukocytes, white blood cells) are involved in the specific immune response. T lymphocytes circulate in the blood before migrating to the thymus where they develop into specialized cells (helper T cells and killer T cells) that are able to identify antigens and infected tissue cells. Platelets are blood cell fragments that play an essential role in blood clotting and wound repair. When an injury such as a cut is sustained, platelets change their shape (now known as activated platelets), become sticky and build up on a vessel wall to form a plug. Magnification: x1,200 when shortest axis printed at 25

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