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MDCAT Biology QUESTION #11257
Question 1
The oxygen-carrying capacity of blood is primarily determined by:
  • The number of white blood cells
  • The hemoglobin concentration✔️
  • The plasma protein level
  • The platelet count
Correct Answer Explanation
Hemoglobin is the iron-containing protein in red blood cells that binds and transports oxygen. Each hemoglobin molecule can carry up to 4 oxygen molecules. The oxygen-carrying capacity is directly proportional to hemoglobin concentration.