Folds formed from the mucosa and submucosa that are perpendicular to the long axis of the duodenum are called
a. intestinal glands.
b. lacteals.
c. microvilli.
d. plicae circulares.
e. villi.
Answer: D
Feedback : Plicae circulares are the folds formed by the mucosa and submucosa that run perpendicular to the long axis of the duodenum.