Ruminant stomachs have four compartments. Which is one of them in correct order?

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

Answer: (D)

Food goes through a specific flow in a ruminant’s stomach: it starts with fermentation in the largest chamber, the rumen, where microbes break down fibrous plant material. The reticulum sits with it, and together they form the reticulorumen, helping sort particles and smooth entry into the next stage. After that processing, the material moves to the omasum, where water absorption and further particle size reduction occur. Finally, it enters the abomasum, the true stomach, where acid and digestive enzymes do the chemical digestion.

This sequence—rumen, reticulum, omasum, abomasum—matches both the anatomy and the functional flow of digestion in ruminants, making it the correct order.