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A blood cell, also called a hematocyte or hematopoietic cell, is a cell produced through hematopoiesis and is normally found in blood. In mammals, these fall into three general categories: * Red blood cells – Erythrocytes * White blood cells – Leukocytes * Platelets – Thrombocytes. Together, these three kinds of blood cells add up to a total 45% of the blood tissue by volume, with the remaining 55% of the volume composed of plasma, the liquid component of blood. This volume percentage hematocrit is measured by centrifuge or flow cytometry and is 45% of cells to total volume in males and 40% in females. Haemoglobin (the main component of red blood cells) is an iron-containing protein that facilitates transportation of oxygen from the lungs to tissues and carbon dioxide from tissues to the lungs. ==Red blood cells (Erythrocytes)== (詳細はRed blood cells primarily carry oxygen and collect carbon dioxide through the use of haemoglobin, and have a lifetime of about 120 days. In the process of being formed they go through a unipotent stem cell stage. They have the job alongside the white blood cells of protecting the healthy cells. RBcs are formed in the red bone marrow in the adults.After the completion of their lifespan,they are destroyed in the spleen. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Blood cell」の詳細全文を読む スポンサード リンク
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