The number of oxygen molecules that are transported by one hemoglobin molecule is:
Correct answer: B. 4
- A. 1
- B. 4
- C. 3
- D. 2
- E. 5
Explanation
Hemoglobin is a protein found in red blood cells that has four heme groups, each capable of binding to one oxygen molecule. Thus, one hemoglobin molecule can transport a maximum of four oxygen molecules at a time. Options 1, 2, and 3 are incorrect as they suggest fewer binding sites than are available. Option 5 is incorrect as hemoglobin cannot bind more than four oxygen molecules.
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The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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