Hematopoiesis Definition – Pluripotency, Differentiation, and Proliferation

Definition of Hematopoiesis The process through which the body generates new blood cells. In the adult, the red bone marrow and the lymph tissues (primarily the lymph nodes and the spleen) manufacture the blood cells the body needs, with extramedullary resources for erythrocyte production available as reserves from the liver, spleen (erythrocytes), and yellow bone marrow. Researchers […]

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Hemolysis – Definition and Conditions

Definition of Hemolysis The destruction and disassembly of erythrocytes (red blood cells). Erythrocytes live in the blood for about 120 days after their release from the bone marrow. At the end of this time they either die or the spleen culls them from circulation. The spleen partially dismantles the erythrocytes, reducing toxic heme into bilirubin […]

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Leukemia – Definition, Types, Symptoms and Treatment

Definition of Leukemia A type of cancer that affects the bone marrow’s production of leukocytes (white blood cells). Doctors classify leukemia as either myeloid (sometimes called myelocytic) or lymphocytic (sometimes called lymphoblastic), depending on the type of leukocytes affected. Within either classification leukemia can be acute or chronic. The Four Most Common Types of Leukemia […]

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Leukocyte – Definition, Function, Conditions

Definition of Leukocyte – White Blood Cells A white blood cell, also referred to as a WBC. Leukocytes are the foundation of the body’s immune response and are phagocytic-that is, they have the ability to consume other cells. They circulate in the blood and the lymph as well as reside in tissues throughout the body. There are […]

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The Blood and Lymph System

Blood and Lymph System Definition The blood and lymph are the cell-bearing fluids that nourish and protect the body. Physician specialists who treat conditions of the blood and lymph are hematologists. Functions of the Blood and Lymph The blood and the lymph are the body’s vital fluids, sharing responsibility for nourishment, cleansing, immune response, and […]

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Lymphocytes – Definition, T-cells, B-cells

Definition of Lymphocytes A type of leukocyte (white blood cell) that primarily resides in the lymph and lymph tissues. Lymphocytes are the body’s primary immune defense and move through the lymph in response to antigens and pathogens. When more rapid deployment is necessary, lymphocytes enter the bloodstream. About 1 percent of the body’s lymphocyte population […]

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Albumin – Definition and Levels – Normal, Low, High

Definition of Albumin Albumin is the most abundant protein in plasma – transports various molecules through the blood and helps sustain the blood’s oncotic pressure, keeping fluid from seeping into the tissues. Albumin is among the numerous plasma proteins the liver produces and is also available as a blood product for transfusion. Blood banks obtain it by separating it, using […]

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Lymphocytopenia – Definition and Causes

Definition of Lymphocytopenia Lymphocytopenia – a decline in the number of lymphocytes in the blood to fewer than 1,000 lymphocytes per microliter of whole blood. Lymphocytes circulate in the blood and the lymph, their primary role being to identify and attack invading pathogens to prevent and fight infection. Lymphocytopenia often accompanies immunodeficiency disorders, notably HIV/AIDS (in which it may be one of the […]

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Anemia – causes, symptoms and treatment

Definition Anemia A reduced ability of the blood to meet the body’s oxygenation needs arising from either a diminished volume of erythrocytes (red blood cells) in the blood or from reduced hemoglobin content in the erythrocytes. Though the common perception of anemia is that it is itself a health condition, doctors consider anemia an indication […]

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Lymphoma – Definition, Symptoms and Treatment

Definition of Lymphoma Lymphoma is a type of cancer that affects the hematopoietic functions of the lymph system that results in the uncontrolled proliferation of lymphocytes, the type of leukocyte  (white blood cell) that the lymph tissues primarily produce. The lymphocytes congregate in the lymph tissues to form tumors. Lymphoma vs Leukemia Leukemia and lymphoma are both cancers […]

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