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Question

Difficulty: MediumAnimal Nutrition and Digestive System

Match each specialized digestive organ or structure found in animals with its primary physiological function in nutrition.

  • RumenFermentation of cellulose by symbiotic microorganisms prior to gastric digestion
  • CropTemporary storage and softening of ingested food before gastric breakdown
  • GizzardMechanical breakdown and grinding of coarse food particles using muscular walls or grit
  • VilliMaximizing internal surface area for absorption of digested nutrients into the bloodstream

Answer

Rumen matches with cellulose fermentation by symbiotic microorganisms; Crop matches with temporary storage and softening of food; Gizzard matches with mechanical breakdown and grinding of food; Villi match with maximizing surface area for nutrient absorption.
Each specialized digestive organ corresponds directly to its anatomical role in comparative animal nutrition: the rumen houses microbes for fermenting plant fibers, the crop stores and moistens food, the gizzard mechanically grinds coarse materials, and intestinal villi expand the absorptive surface area.

Step-by-Step Solution

1
Identify the primary function of the rumen in ruminants.
The rumen acts as a fermentation vat containing symbiotic microflora to hydrolyze cellulose.
Ruminants lack endogenously produced cellulase enzymes and rely on microbial fermentation in the rumen.
2
Determine the role of the crop in birds and insects.
The crop temporarily stores swallowed food and lubricates it with secretions before it enters the stomach.
Birds lack teeth for mastication, requiring an anatomical site to hold and soften unchewed food items.
3
Determine the role of the gizzard.
The muscular gizzard performs physical triturating (grinding) of hard food seeds or grains.
Mechanical digestion must substitute for teeth in birds, earthworms, and certain invertebrates.
4
Match villi to their intestinal function.
Villi increase the total surface area available for diffusion and active transport of digested nutrients.
Epithelial foldings maximize contact area between chyme and intestinal capillaries/lacteals.

Key Concept

Comparative Animal Digestive Structures and Adaptations
Estimated Time:1m 0s
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Topics

Animal Nutrition and Digestive System

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