Which statement accurately describes the pathway an oxygen molecule follows as it moves through the lung to the blood?
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.

Question

Quizplus · Accepted Answer

An oxygen molecule travels from a bronchiole (a small airway) to an alveolus (a small sac in the lung where gas exchange occurs) to a capillary (a small blood vessel) to a red blood cell (where the oxygen binds to hemoglobin, a protein within the red blood cell). Therefore, option C is the accurate description of the pathway.

Which Statement Accurately Describes the Pathway an Oxygen Molecule Follows