How is Oxygen and Carbon Dioxide Transported in Human Beings

Question: Which of the following statements about the transport of oxygen and carbon dioxide in humans is true?

  1. Oxygen is transported in the blood dissolved in the plasma.
  2. Carbon dioxide is transported in the blood bound to hemoglobin.
  3. Both oxygen and carbon dioxide are transported in the blood bound to hemoglobin.
  4. Oxygen is diffused into the tissues from the blood plasma.

Answer: C. Both oxygen and carbon dioxide are transported in the blood bound to hemoglobin.

Solution: Hemoglobin is a protein in red blood cells that binds to both oxygen and carbon dioxide. This allows the blood to carry much more of these gases than it could if they were simply dissolved in the plasma.

Oxygen is primarily transported in the blood, bound to a molecule called hemoglobin in red blood cells. When we breathe, oxygen from the air enters our lungs and diffuses into the bloodstream through tiny air sacs called alveoli. Hemoglobin in red blood cells binds to the oxygen, forming oxyhemoglobin. The oxygen-rich blood is then pumped by the heart to the various tissues and organs in the body through a network of blood vessels.

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