Biology 3 – Introduction to Biology
Los Angeles Southwest College Spring 2013
Instructor: Robert L. Stewart, Jr.
Sickle cell anemia affects people with African, Mediterranean, Middle Eastern, and Indian ancestry (Scientific American). Sickle cell anemia occurs when a person inherits two sickle cell gene, one from each parent, that cause the red blood cells to change and become crescent shaped. The underlying problem involves hemoglobin, a component of the red blood cells. Hemoglobin is a protein molecule in red blood cells that carries oxygen from the lungs to the body’s tissues and returns carbon dioxide from the tissues to the lung. In sickle cell anemia, the hemoglobin is flawed (The New York Times). As a result, the cells become sickle shaped and can’t travel as easily through blood vessels. Sickle cell anemia is an illness, which has one primary cause, but a variety of symptoms and treatments (Scientific American.) Like some illnesses, sickle cell anemia has one primary cause. In order for sickle cell anemia to occur is when a sickle cell gene have, been inherited from both the mother and the father, so that the child has two sickle cell gene. The sickle cell gene causes the body to make abnormal hemoglobin. As mentioned above, hemoglobin is a protein molecule in red blood cells that carries oxygen from the lungs to the body’s tissues and returns carbon dioxide from the tissues to the lungs. A person with normal red blood cell will have hemoglobin A; however, a person with sickle cell disease will have hemoglobin S (Journal of America Medical Association) Normal red blood cells are usually round and soft and travel easily through small vessels; however, sickle cells are abnormally shaped and stiff, thus causing them to have difficulty travelling through small vessels. Sickle cells can clog vessels depriving tissues of oxygen. As spoken of in two articles (US News and World Report). Sickle cells have a shorter life span...
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