Item BF044005: Most oxygen molecules move from the lungs to the blood by entering capillaries.

Which of the following statements is TRUE about the movement of oxygen molecules between the lungs and cells of the body?

  1. Most oxygen molecules move from the lungs to cells of the body by entering microscopically small blood vessels (capillaries) and then moving to cells through the circulatory system.
  2. Most oxygen molecules move from cells of the body to the lungs by moving through the circulatory system and then leaving the circulatory system by way of capillaries at the lungs.
  3. Most oxygen molecules move from the lungs to the heart by way of special respiratory tubes where the oxygen molecules mix with the blood.  Blood then moves to cells of the body by way of the circulatory system.
  4. Oxygen molecules enter and leave the body by way of lungs, but they do not move between the lungs and the blood.

Distribution of Responses

Chart showing distrubtion of responses for Item BF044005

Percent of students responding correctly

Overall30%
Grades 6–829%
Grades 9–1230%
Male32%
Female27%
Primary Language is English30%
Primary Language is not English29%

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