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2024-02-21T06:50:33Z

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[[Image:Red White Blood cells.jpg|thumb|right|A [[scanning electron microscope]] (SEM) image of a normal [[red blood cell]] (left), a [[platelet]] (middle), and a [[white blood cell]] (right)]]
One microliter of blood contains:
* '''4.7 to 6.1 million (male), 4.2 to 5.4 million (female) [[erythrocyte]]s:''' Red blood cells contain the blood's [[hemoglobin]] and distribute oxygen. Mature red blood cells lack a [[Cell nucleus|nucleus]] and [[organelle]]s in mammals. The red blood cells (together with [[endothelial]] vessel cells and other cells) are also marked by [[glycoprotein]]s that define the different [[Human blood group systems|blood types]]. The proportion of blood occupied by red blood cells is referred to as the [[hematocrit]], and is normally about 45%. The combined surface area of all red blood cells of the human body would be roughly 2,000 times as great as the body's exterior surface.
* '''4,000–11,000 [[leukocyte]]s:''' White blood cells are part of the body's [[immune system]]; they destroy and remove old or aberrant cells and cellular debris, as well as attack infectious agents ([[pathogen]]s) and foreign substances. The cancer of leukocytes is called [[leukemia]].
* '''200,000–500,000 [[thrombocytes]]:''' Also called [[platelet]]s, they take part in blood clotting ([[coagulation]]). Fibrin from the coagulation cascade creates a mesh over the [[platelet plug]].

Translations:Blood/12/en - Revision history

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