American Board of Surgical Assistants (ABSA) Certification Practice Exam

The component responsible for transporting oxygen and carbon dioxide in the bloodstream is red blood cells. These cells contain hemoglobin, a specialized protein that binds to oxygen in the lungs and carries it to the tissues of the body. Hemoglobin also facilitates the pickup of carbon dioxide, which is a waste product of metabolism. Once red blood cells reach the tissues, they release oxygen for cellular use and pick up carbon dioxide to be transported back to the lungs, where it is exhaled. This critical function of red blood cells is essential for maintaining homeostasis and supporting cellular metabolism throughout the body.

In contrast, platelets are primarily involved in the clotting process, helping to prevent excessive bleeding. Fresh Frozen Plasma is a blood product that contains clotting factors and proteins, and is used for volume expansion and treatment of clotting disorders. White blood cells play a key role in the immune response, defending the body against infection and disease, but they do not have a role in the transport of gases such as oxygen and carbon dioxide.