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The blood that circulates in the human body supplies organs and tissues with the necessary substances. Most people's bodies contain almost six liters of blood, the exact amount mainly depending on their body mass. Blood is the most important transport medium in our organism, which takes on the supply of oxygen and nutrients as well as the removal of metabolic products. In addition, the blood and especially the white blood cells (leukocytes) play a crucial role in immune defense. They help to eliminate pathogens and harmful endogenous cells. Blood formation is an ongoing process of renewal, which can be disrupted by various factors such as a massive iron deficiency or leukemia (blood cancer). An analysis of the blood picture can be used to identify numerous diseases, which makes the blood test one of the most important diagnostic tools in medicine. (fp)
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