The plicae circulares and intestinal villi are found in which of the four layers alimentary tube wall?

The correct answer is tunica mucosa

The plicae circulares and intestinal villi are both folds of the mucosa. The plicae circulares are larger and found in the small intestine, while the intestinal villi are smaller and found in the large intestine. The submucosa contains blood vessels, nerves, and lymphatic vessels. The muscularis externa is responsible for the movement of food through the alimentary tube. The serosa is the outermost layer and is made up of connective tissue.