Red Blood Cell
Red blood cells, or erythrocytes, are the most common type of blood cell and the vertebrate organism's principal means of delivering oxygen (O2) to the body tissues via the blood flow through the circulatory system. They take up oxygen in the lungs or gills and release it while squeezing through the body's capillaries.
These cells' cytoplasm is rich in haemoglobin, an iron-containing biomolecule that can bind oxygen and is responsible for the blood's red color.
In humans, mature red blood cells are oval and flexible biconcave disks. They lack a cell nucleus and most organelles to accommodate maximum space for haemoglobin. 2.4 million new erythrocytes are produced per second. The cells develop in the bone marrow and circulate for about 100–120 days in the body before their components are recycled by macrophages. Each circulation takes about 20 seconds. Approximately a quarter of the cells in the human body are red blood cells.
Red blood cells are also known as RBCs, red cells, red blood corpuscles (an archaic term), haematids, erythroid cells or erythrocytes (from Greek erythros for "red" and kytos for "hollow", with cyte translated as "cell" in modern usage).
Other articles related to "red blood cell, cells, blood, red blood cells, cell, red":
... Research interest in the use of artificial cells for blood arose after the AIDS scare of the 1980s ... Besides bypassing the potential for disease transmission, artificial red blood cells are desired because they eliminate drawbacks associated with allogenic blood transfusions such as blood typing, immune reactions ... Attempts have been made to develop a complete working red blood cell which comprises carbonic not only an oxygen carrier but also the enzymes associated with the cell ...
... EPO stimulates the bone marrow in order to increase red blood cell production and thus the body's ability to carry oxygen ... "Average" red blood cell volume of the population at sea level is about 45% red blood cells ... About 5% of the population has less than 40% red blood cell, which is defined as "anemia" and 5% of the population, including many world class athletes ...
... Blood diseases involving the red blood cells include Anemias (or anaemias) are diseases characterized by low oxygen transport capacity of the blood, because of low red ... and hemoglobin, which contains iron, cannot be formed Sickle-cell disease is a genetic disease that results in abnormal hemoglobin molecules ... their oxygen load in the tissues, they become insoluble, leading to mis-shaped red blood cells ...
... can occur under certain conditions in a few different cell types ... This can lead to problems for a cell, or it may lead to a cell receiving a signal to undergo apoptosis ... a couple of examples of irregular fragmentation that can occur in cells ...
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Famous quotes containing the words cell, red and/or blood:
“It is plain that there is no separate essence called courage, no cup or cell in the brain, no vessel in the heart containing drops or atoms that make or give this virtue; but it is the right or healthy state of every man, when he is free to do that which is constitutional to him to do.”
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“I shall go among red faces and virile voices,
See stylish sheep, with fine heads and well-wooled,
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“Dust fanned in scraped puffs from the earth
Between his arms, and blood turned his face inside out,
To demonstrate its suppleness
Of veins, as he perfected his role.”
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