White blood cells, or white blood cells, are an important blood cell in the blood. In addition to white blood cells, human blood also contains red blood cells, platelets and plasma.
White blood cells, as part of the immune system, help the body fight infectious diseases and foreign things. Under normal conditions, white blood cells are 4 x 10^9 to 11 x 10^9 per liter of blood in healthy adults.
White blood cells are also commonly referred to as immune cells. In addition to blood, white blood cells are found in the lymphatic system, the spleen, and other tissues of the body.
There are five types of white blood cells in the blood, ranging from small to large: lymphocytes, basophils, neutrophils, monocytes and eosinophils.
White blood cells are a kind of nucleated blood cells. The number of blood cells in normal people is 4000-10000/UL (microliter). Under different functional times and different functional states, the number of white blood cells in the blood varies greatly. When there are more than 10,000 per microliter, it is called leukocytosis; when there is no microliter of less than 4000, it is called leukopenia. When the body has inflammation (ie inflammation), leukocytosis occurs; leukopenia may have heredity Sex, familial, acquired, etc. Among them, gain is the majority. Drugs, radiation, infections, toxins, etc. can all reduce granulocytes, and drugs are most common.
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