According to the American Society of Hematology (ASH), the average life span of a red blood cell is 120 days. New cells form in bone marrow and take about seven days before they mature and enter the bloodstream. Red blood cells make up about 40 percent of blood's volume.
ASH explains that one of the functions of red blood cells is to carry oxygen from lungs to body tissues. There, they pick up carbon dioxide, a waste produce, and transport it to the lungs where it is exhaled. The protein hemoglobin is primarily responsible for these jobs. Hemoglobin gives red blood cells their color, and because of the large number of red blood cells, blood is also red.Learn More
Red blood cells have no nucleus, because most of their bulk is made up of hemoglobin, a compound that carries gases, such as oxygen and carbon dioxide. In fact, about a third of a red blood cell is dedicated to hemoglobin alone, so no room remains for a nucleus or many of the structures that other cells have.Full Answer >
According to Santa Barbara City College, red blood cells' biconcave shape gives them a vastly greater surface area than a spherical cell of similar volume, which allows them to absorb oxygen more efficiently. Red blood cells achieve this shape by losing their nucleus and many other organelles during development. Red blood cells can neither reproduce nor replenish cellular machinery, and they die off in large numbers over time.Full Answer >
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.Full Answer >
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.Full Answer >