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Difficulty: MediumAnimal Nutrition and Digestive System

Match each compartment of the ruminant stomach with its primary physiological function during digestion.

  • RumenFermentation of plant cellulose by microbial flora and temporary food storage
  • ReticulumFormation of cud boluses for regurgitation and trapping dense foreign materials
  • OmasumAbsorption of water and dissolved volatile fatty acids from the ingesta
  • AbomasumSecretion of hydrochloric acid and digestive enzymes for gastric protein digestion

Answer

Rumen matches with fermentation of plant cellulose and temporary storage; Reticulum matches with formation of cud boluses for regurgitation; Omasum matches with absorption of water and volatile fatty acids; Abomasum matches with secretion of hydrochloric acid and enzymes for protein digestion.
Ruminant digestion relies on four distinct stomach chambers: the rumen functions as the primary fermenter housing micro-organisms that break down cellulose; the reticulum collects dense particles and forms cud for remastication; the omasum extracts excess water and volatile fatty acids through its folded walls; and the abomasum operates as the true glandular stomach producing hydrochloric acid and pepsin.

Step-by-Step Solution

1
Identify the microbial fermentation chamber
The rumen harbors microbial symbionts that break down tough plant cell walls (cellulose).
Mammals lack cellulase enzymes and rely on rumen microorganisms.
2
Identify the chamber responsible for cud formation
The reticulum works closely with the rumen to form small food balls (cud) for regurgitation back to the mouth.
Rumination requires mechanical re-mastication to reduce particle size.
3
Identify the water-absorbing chamber
The omasum filters and reabsorbs water and electrolytes before material enters the true stomach.
Its highly folded internal surface area maximizes fluid reabsorption.
4
Identify the true enzymatic stomach
The abomasum secretes gastric juices containing hydrochloric acid and pepsin.
This is the only chamber with digestive glands producing endogenous enzymes in ruminants.

Key Concept

Ruminant Stomach Specialized Compartments
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Topics

Animal Nutrition and Digestive System

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