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www.reference.com/science/red-blood-cells-76cc71f6ea4d6f67

Red blood cells carry oxygen and nutrients to the tissues in the body and take away carbon dioxide. They are also called erythrocytes. They get their red color from a pigment called hemoglobin, and it is the hemoglobin that actually carries the oxygen and carbon dioxide.

www.reference.com/science/causes-red-blood-cells-small-size-38a469ff4fc45823

Microcytic anemia is the condition wherein red blood cells are smaller than normal, and it is primarily caused by iron deficiency anemia and thalassemia, according to Dr. Siamak T. Nabili writing for eMedicineHealth. Iron deficiency anemia occurs due to limited or inadequate iron intake.

www.reference.com/article/causes-high-red-blood-cell-count-6720c67fa5e3ffa1

Genetic mutations, both inherited and acquired, are one primary cause of high red blood cell counts, also known as polycythemia, says MedicineNet. Sleep apnea and tumors are secondary causes of polycythemia.

www.reference.com/article/large-red-blood-cells-symptom-cancer-fa5d81e07c36fdfc

Large red blood cells, called macrocytosis, are not a cancer symptom but may signal a problem that needs to be examined medically, explains Mayo Clinic. Macrocytosis is not a disease and does not produce symptoms or signs. Vitamin B-12 or folate deficiencies, liver disease, hypothyroidism and alcoho

www.reference.com/world-view/cause-enlarged-red-blood-cells-bdc70943b19094e

According to the Mayo Clinic, enlarged red blood cells, or macrocytosis, is a non-specific medical condition that has a number of different causes. Among the most common are vitamin B12 deficiency, folate deficiency, alcoholism, hypothyroidism (under-active thyroid) and liver disease. Other causes i

www.reference.com/science/red-blood-cells-specialized-82bbe77037c57d32

According to Springfield Technical Community College, the primary role red blood cells play in the body is to transport oxygen from the lungs to the various body tissues. To carry out this task, the cells are filled with a substance called hemoglobin. Hemoglobin is so important to red blood cells th

www.reference.com/world-view/causes-increase-red-blood-cell-count-a74078ce13ecdfcd

Several medical conditions ヨ dehydration, cigarette smoking and certain medications ヨ may cause high red blood cell counts, according to MedlinePlus. To intentionally increase low red blood cell counts as treatment for anemic patients, options include vitamin and mineral supplementation, blood trans

www.reference.com/article/long-red-blood-cells-live-f32452136131161a

A normal red blood cell lives for about 120 days. It takes about two days for the body to manufacture each red blood cell, and about two million are turned out every second. Production of new red blood cells occurs in the bone marrow.

www.reference.com/world-view/causes-red-blood-cell-count-low-b45af9f8b346c56b

One cause of low red blood cell count is pregnancy, but this is normal, according to Mayo Clinic. However, among the many other conditions and diseases that can cause a low red blood cell count are cancer, aplastic, vitamin-deficiency and iron-deficiency anemia, internal or external bleeding and por

www.reference.com/article/blood-red-296fb8cb15832643

Humans have red blood because it contains iron. Another way of explaining why humans have red blood is that the color is due to hemoglobin, which is the protein associated with iron that makes blood red.