Erthryocytes
red blood cells
Erythrocytes, also known as red blood cells, are specialized cells responsible for carrying oxygen from the lungs to body tissues and taking carbon dioxide from the tissues to the lungs to be exhaled. Erythrocytes are the most abundant cell type in our bloodstream, making up about 40-45% of the total blood volume.
Erythrocytes are produced in the bone marrow through a process called erythropoiesis. In healthy adults, erythropoiesis occurs primarily in the vertebrae, sternum, and pelvic bones. The production of erythrocytes is regulated by a hormone called erythropoietin (EPO), which is synthesized and secreted by the kidneys in response to low oxygen levels in the bloodstream.
Erythrocytes are unique in that they do not have a nucleus or organelles such as mitochondria, which are necessary for energy production. This allows the erythrocytes to be extremely flexible and deformable, enabling them to easily pass through the tiniest blood vessels (capillaries) and deliver oxygen to tissues throughout the body.
The lifespan of erythrocytes is about 120 days, after which they are removed from circulation and broken down by the spleen. The iron from the hemoglobin molecules within the erythrocytes is recycled and used to produce new erythrocytes. Any remaining components are excreted through the digestive system.
Diseases and disorders related to erythrocytes include anemia (a condition characterized by decreased numbers of erythrocytes or decreased hemoglobin concentrations), sickle cell disease (a genetic condition in which the shape of the erythrocytes is abnormal), and polycythemia (a condition characterized by increased numbers of erythrocytes).
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