What is the primary function of the rugae in the stomach?

What is the primary function of the rugae in the stomach?

• A. To allow expansion
• B. To produce enzymes
• C. To absorb nutrients
• D. To propel chyme

Answer: (A)

The rugae are folds in the stomach lining that mainly allow the stomach to expand as it fills. When you haven’t eaten, these folds are prominent; as you eat, they unfold and the stomach stretches to accommodate a larger volume without a big increase in pressure. This expansion capability is essential for storing and mixing food before it moves on to digestion. Rugae themselves don’t produce enzymes or absorb nutrients; those tasks are handled by the stomach’s glands and by the small intestine, respectively. And the propulsion and mixing of chyme are driven by smooth muscle contractions, not the folds. So the primary function of the rugae is to enable expansion to hold more content.

The rugae are folds in the stomach lining that mainly allow the stomach to expand as it fills. When you haven’t eaten, these folds are prominent; as you eat, they unfold and the stomach stretches to accommodate a larger volume without a big increase in pressure. This expansion capability is essential for storing and mixing food before it moves on to digestion.

Rugae themselves don’t produce enzymes or absorb nutrients; those tasks are handled by the stomach’s glands and by the small intestine, respectively. And the propulsion and mixing of chyme are driven by smooth muscle contractions, not the folds. So the primary function of the rugae is to enable expansion to hold more content.