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www.reference.com/article/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/article/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 i...

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/article/should-red-blood-cells-urine-bdd75b62841276db

It is normal for there to be a very small number of red blood cells in urine, according to MedlinePlus. However, the exact amount that counts as normal may differ, depending on the laboratory that performs the test.

www.reference.com/article/blood-red-a013fbe0a40879d5

The red color of blood comes from the hemoglobin that makes up the majority of the mass of the cell, which allows the blood cell to carry oxygen around the body. The plasma itself is a straw color when viewed under a microscope, but the hemoglobin makes up so much of th...

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.

www.reference.com/article/red-blood-cell-adapted-99c28c8eff1730a9

Two adaptations that have been made by the red blood cell are the lack of a nucleus and organelles, or small, specialized bodies in the cell. This allows for more room in the blood cell for hemoglobin.