Identify the four compartments of a ruminant stomach.

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

Answer: (C)

A ruminant stomach is made up of four compartments that work together to break down fibrous plant material before true digestion. The four parts are rumen, reticulum, omasum, and abomasum. The rumen is a large fermentation vat where microbes break down cellulose and produce volatile fatty acids that the animal uses for energy. The reticulum sits with the rumen and helps form the cud for chewing and regurgitation, plus it acts as a trap for heavy or foreign items. The omasum specializes in absorbing water and continuing particle reduction as digestion proceeds. The abomasum is the true glandular stomach, secreting acid and enzymes to digest nutrients much like a monogastric stomach.

So, the best answer lists all four compartments, confirming you know each part of the ruminant stomach and how they fit into the overall digestive process. The order of listing isn’t what matters; recognizing all four names is the key.