Which stomach compartment in ruminants is considered the true stomach?

Which stomach compartment in ruminants is considered the true stomach?

• A. Rumen
• B. Reticulum
• C. Omasum
• D. Abomasum

Answer: (D)

In ruminants, the true stomach is the glandular compartment where acid and digestive enzymes are secreted to begin chemical digestion, much like a monogastric stomach. This role is carried out by the abomasum, which contains gastric glands that produce hydrochloric acid and pepsinogen, creating the acidic environment and proteolytic digestion necessary for proteins. The other three compartments—the rumen, reticulum, and omasum—are primarily fermentation and mechanical processing chambers; they don’t perform acid-based digestion. They prepare the ingesta and provide microbial fermentation before it moves to the abomasum for final digestion.

In ruminants, the true stomach is the glandular compartment where acid and digestive enzymes are secreted to begin chemical digestion, much like a monogastric stomach. This role is carried out by the abomasum, which contains gastric glands that produce hydrochloric acid and pepsinogen, creating the acidic environment and proteolytic digestion necessary for proteins. The other three compartments—the rumen, reticulum, and omasum—are primarily fermentation and mechanical processing chambers; they don’t perform acid-based digestion. They prepare the ingesta and provide microbial fermentation before it moves to the abomasum for final digestion.