Which of the Following Best Describes the Journey of an Oxygen

Question

Which of the following best describes the journey of an oxygen molecule in a lung?
A)It travels from an alveolus to a bronchiole to a capillary to a red blood cell to hemoglobin.
B)It travels from a bronchiole to an alveolus to a capillary to hemoglobin to a red blood cell.
C)It travels from a bronchiole to an alveolus to a capillary to a red blood cell to hemoglobin.
D)It travels from a bronchiole to an alveolus to a red blood cell to a capillary to hemoglobin.

Accepted Answer

An oxygen molecule enters the lung through a bronchiole, then moves into an alveolus (air sac) where it diffuses across the alveolar membrane and into a capillary. The oxygen molecule then binds to a red blood cell, specifically to the hemoglobin protein inside the red blood cell, which then transports the oxygen molecule to the body's tissues.