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.
Hemoglobin is a molecule that bonds with oxygen and delivers it to the cells. Hemoglobin also gives red blood cells their red color. The development of a cell specialized in carrying oxygen throughout the body allows oxygen to be utilized more efficiently by an organism.
Red blood cells don't use the oxygen they carry because they lack organelles, such as mitochondria. Because they have no nuclei, they have no DNA or RNA and can't divide or repair themselves well. They live about 100 days before they are destroyed.
Other adaptations of red blood cells are their donut shape and flexibility. These adaptations allow them to squeeze through tiny capillaries.
Red blood cells also release adenosine triphosphate, or ATP when they find themselves in very narrow blood vessels. ATP causes the vessels to open up. Red blood cells also produce hydrogen sulfide, which signals the blood vessels to relax.
When the body is invaded by a pathogen, red blood cells attack it with free-radical molecules, which destroy the pathogen's cell walls.Learn More
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 >
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 that its molecules comprise one-third of the cell’s volume.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 >