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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

The indigestibility of cellulose by humans is a consequence of the absence of cellulase. However, cellulose still plays an essential role in the human diet as

A. A source of essential monosaccharides
B. Dietary fiber that provides bulk and promotes peristalsis in the digestive tract
✓
C. An inhibitor of cholesterol absorption in the small intestine
D. A precursor for the synthesis of vitamin K in the liver

📝 Explanation

While providing no calories, the insoluble cellulose fibers absorb water, increasing fecal bulk. This bulk stimulates stretch receptors in the gut wall, promoting peristaltic contractions and helping prevent constipation and related disorders.

📖 Additional Information

  • A source of essential monosaccharides
  • Dietary fiber that provides bulk and promotes peristalsis in the digestive tract
  • An inhibitor of cholesterol absorption in the small intestine
  • A precursor for the synthesis of vitamin K in the liver

While providing no calories, the insoluble cellulose fibers absorb water, increasing fecal bulk. This bulk stimulates stretch receptors in the gut wall, promoting peristaltic contractions and helping prevent constipation and related disorders.

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