Which anatomical feature of the stomach helps accommodate varying volumes of food?

• A. Plicae Circulares
• B. Microvilli
• C. Rugae
• D. Villi

Answer: (C)

Stomach distensibility is achieved through its mucosal folds called rugae. When the stomach is empty, these folds are pronounced, giving a wrinkled lining. As you eat and the stomach fills, the rugae unfold and the stomach stretches, allowing it to accommodate larger volumes of food and liquid without a big rise in pressure. This knack for expansion is exactly what lets the stomach handle varying amounts of content.

In contrast, the circular folds known as plicae circulares are features of the small intestine that help slow chyme and increase surface area for absorption. Microvilli and villi are tiny projections on intestinal epithelial cells that greatly boost absorptive surface area there. They aren’t the structures the stomach relies on to expand for different volumes.