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Red blood cells.
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the red blood cells, the main component of the microscopic 'formed elements' in the circulating blood, about 5 × 106 per mm3 (5 × 1012 per litre). Contain the pigment haemoglobin which is essential for the uptake of oxygen in the lungs and its transport to the tissues; also for exchanges with the blood plasma involved in carbon dioxide transport and in blood buffering systems. See also bone, erythropoiesis, haematocrit, leucocytes, oxyhaemoglobin dissociation curve.

erythrocytes (ē·rithˑ·rō·sīts), red blood cells. They circulate oxygen through the body and remove carbon dioxide.
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Patient discussion about erythrocytes

Q. what is a normal red blood cell count for breast cancer after operation

A. i know that the normal count is between 4.2 to 5.9 million cells/cmm. if you have anything else- i think this question should be to the Doctor...cause even if someone here will tell you it's ok that it's a bit low- the Doctor should know that and he has your chart with all your medical information. there for i would give him a phone call to ask if it's o.k. - unless you are in the normal average i told you, then you shouldn't worry about it.

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