CAMRT Radiography Practice Exam

What are Plia circularis?

1. Folds of muscular tissue in the stomach

2. Valves of the heart

3. Numerous folds of the mucous membrane of the small intestine

4. Connective tissues in the liver

The correct answer is: Numerous folds of the mucous membrane of the small intestine

Plia circularis refers to the numerous folds of the mucous membrane found in the small intestine, specifically in the jejunum and ileum. These circular folds increase the surface area for absorption and play a crucial role in the digestive process. The presence of these folds helps to slow down the passage of chyme, which maximizes nutrient absorption by providing more time for the intestinal enzymes to break down food particles. The structure and function of plia circularis are fundamental for efficient digestion and nutrient uptake, distinguishing them significantly from other anatomical features mentioned in the options. For example, the folds of muscular tissue in the stomach are known as rugae, and the valves of the heart are entirely unrelated to the intestinal structure, as they serve a role in regulating blood flow. Connective tissues in the liver pertain to a different organ system and function. Understanding plia circularis highlights the complexity and specialization of the small intestine in the digestive system, wherein those folds are key for effective nutrient processing.