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Red blood cell

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Red blood cell, platelet, and white blood cell
Red blood cell, platelet, and white blood cell

Red blood cell (also known as erythrocytes) are cells in the blood that carry oxygen to all parts of the body. They are made in the spongy marrow inside the large bones of the body. Bone marrow constantly makes new red blood cells to replace old ones. Normal red blood cells last about 120 days in the bloodstream and then die. Their main role is to carry oxygen, but they also remove carbon dioxide (a waste product) from cells and carry it to the lungs to be exhaled.[1]

Contents

Hemoglobin

Hemoglobin protein showing various subunits
Hemoglobin protein showing various subunits
Main Article: Hemoglobin

Hemoglobin is an iron-rich protein that gives blood its red color and carries oxygen from the lungs to the rest of the body.[1]

Disorders

Misshapen red blood cells characteristic of sickle cell anemia.
Misshapen red blood cells characteristic of sickle cell anemia.
Main Article: Sickle cell anemia

Sickle cell anemia is a serious circulatory system disorder affecting the integrity of red blood cells. Its name is derived from the shape of the cells, which become round and flat resembling a sickle.[1]

Normal red blood cells are smooth and round and move easily through blood vessels to carry oxygen to all parts of the body. Sickle-shaped cells don’t move easily through blood because they’re stiff and sticky and tend to form clumps and get stuck in blood vessels. The clumps of sickle cells block blood flow in the blood vessels that lead to the limbs and organs. Blocked blood vessels can cause pain, serious infections, and organ damage.[1]

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