Kaplan Nursing Entrance Practice Exam

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How many molecules of oxygen can a molecule of hemoglobin hold for transport?

The correct answer is: 4

A molecule of hemoglobin can hold up to four molecules of oxygen for transport within the bloodstream. This capacity is due to the structure of hemoglobin, which consists of four subunits, each containing a heme group that can bind one oxygen molecule. The binding of oxygen occurs in a cooperative manner, meaning that when one oxygen molecule binds, it increases the likelihood of the other heme groups binding additional oxygen molecules. This mechanism enhances oxygen transport efficiency, allowing hemoglobin to effectively deliver oxygen to tissues throughout the body. The other options do not reflect the actual binding capacity of hemoglobin, as each provides a number of oxygen molecules that is lower than the maximum capacity of four.