Dec '13
MCAT Question of the Day | MCAT Course

  • Q:

    Lactose intolerance usually results in fluid movement into the intestines and diarrhea. Individuals who are lactose intolerant are unable to transport the lactose through the membrane of the small intestine, so it accumulates in the lumen if the colon. Which of the following best explains the reason for diarrhea in these individuals?



    Their digestive tract is mounting an immune response against the lactose, which causes inflammation and fluid release into the lumen.


    Water transports into the lumen due to the higher osmolarity of the accumulated sugars.


    Bacteria ultimately metabolize the sugars instead of the individuals, and water is a byproduct of the sugar degradation.


    The body is attempting to flush the indigestible lactose out, and water accumulation in the colon is the fastest way to accomplish this.

    Tags: Digestive System | Suggest a tag


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