Item BF039008: After a boy eats a sandwich, there are fewer molecules from food in the blood approaching the digestive tract and more molecules from food in the blood moving away from the digestive tract.

A boy eats a sandwich for lunch. After several hours, the food is in the small intestine where it is absorbed into the body after having been chemically broken down. If we could now examine the blood in the microscopically small blood vessels (capillaries) approaching and moving away from his small intestine, what would we find?

  1. There would be more molecules from food in the blood approaching the small intestine than in the blood moving away from the small intestine.
  2. There would be fewer molecules from food in the blood approaching the small intestine than in the blood moving away from the small intestine.
  3. There would be about the same number of molecules from food in the blood approaching the small intestine and in the blood moving away from the small intestine.
  4. There would be no molecules from food in the blood approaching the small intestine and no molecules from food in the blood moving away from the small intestine. Even though molecules from food are absorbed from the small intestine into the body, they do not enter the blood.

Distribution of Responses

Chart showing distrubtion of responses for Item BF039008

Percent of students responding correctly

Overall36%
Grades 6–833%
Grades 9–1241%
Male38%
Female34%
Primary Language is English37%
Primary Language is not English31%

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