Anatomy & Physiology Circulatory #13


Which iron laden blood component is the transport agent for oxygen to the cells and tissues within the body?


  1. Platelets
    • Rationale:

      The principal function of platelets is to prevent bleeding not to transport oxygen to the cells and tissues within the body.

  2. Hematocrit
    • Rationale:

      Hematocrit is the ratio of the volume of RBCs to the total volume of blood.

  3. Leukocytes
    • Rationale:

      Leukocytes are a colorless white blood cell (WBC) that circulates in the blood and body fluids. They are primarily responsible for counteracting foreign substances and disease within the blood.

  4. Hemoglobin
    • Rationale:

      Hemoglobin is defined as the iron laden blood component that transports oxygen to the cells and tissues within the body.


Iron is an essential element for blood production.


Learning Outcomes

About 70 percent of the body’s iron is found in the red blood cells (RBCs). Iron that is found in the RBCs is referred to as hemoglobin while iron that is found in the muscle cells of the body is referred to as myoglobin. Hemoglobin is essential for transferring oxygen in the blood from the lungs to the tissues throughout the body.

Test Taking Tip

Consider the function of each blood component to answer this question correctly.

Video Rationale