Platelets clump together to form blood clots or scabs to begin healing after an injury, while white blood cells make up a part of your immune system and fight infection. Red blood cells, also called erythrocytes, carry oxygen from your lungs to tissues throughout your body. Red blood cells live about four months, so your body must constantly create new ones to replace the aged and dying cells.
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The shape of a red blood cell is a biconcave disk with a flattened center-in other words, both faces of the disc have shallow bowl-like indentations (a red blood cell looks like a donut). Production of red blood cells is controlled by erythropoietin, a hormone produced primarily by the kidneys.
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You also need copper to make heme; it helps make sure your cells have access to the chemical form of iron needed for red blood cells. All adults need 900 micrograms of copper daily, according to the Linus Pauling Institute. Men need 8 milligrams of iron each day, and women need 18 milligrams.
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Several B vitamins help produce functional red blood cells. Vitamins B6, B9 and B12 all contribute to the production of hemoglobin, a protein abundant in erythrocytes. Each hemoglobin molecule contains four heme chemical groups, with each group able to carry oxygen.
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Red cells contain a special protein called hemoglobin, which helps carry oxygen from the lungs to the rest of the body and then returns carbon dioxide from the body to the lungs so it can be exhaled. Blood appears red because of the large number of red blood cells, which get their color from the hemoglobin. The percentage of whole blood volume that is made up of red blood cells is called the hematocrit and is a common measure of red blood cell levels.
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Vitamin A helps stems cells develop into red blood cells, ensuring that your body can produce enough red blood cells to replace those that die due to age. It also makes sure your developing red blood cells have access to the iron needed for hemoglobin.
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White blood cells protect the body from infection. They are much fewer in number than red blood cells, accounting for about 1 percent of your blood. The most common type of white blood cell is the neutrophil, which is the immediate response cell and accounts for 55 to 70 percent of the total white blood cell count.
http://www.hematology.org/Patients/Basics/
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It has four main components: plasma, red blood cells, white blood cells, and platelets. Blood has many different functions, including: 1  transporting oxygen and nutrients to the lungs and tissues. 2  forming blood clots to prevent excess blood loss.
http://www.hematology.org/Patients/Basics/
Introduction: Red blood cells are the life cell of the human body. Their job is to carry oxygen from the lungs to the rest of the body. During the transportation it’s necessary for red blood cells (erythrocytes) to squeeze through capillaries and small openings in passageways. In order to do this the cell must be extremely flexible.
http://fessrg.ucsd.edu/Research/RBC/
what blood cells are called erythrocytes
The red blood cells are called as erythrocytes. Erythrocytes are  called red blood cells.