True regarding the ileum*1 pointMore prominent plicae circulares.Less vascular arcadesLess frequent plicae semilunarisMore fat in the mesentery

The ileum, which is the last part of the small intestine, has certain characteristics:

1. More prominent plicae circulares: False. The jejunum, not the ileum, has more prominent plicae circulares (also known as circular folds). These folds help increase the surface area for absorption.

2. Less vascular arcades: False. The ileum has more vascular arcades compared to the jejunum. Vascular arcades are loops of blood vessels in the mesentery. The ileum needs more blood supply due to its location further down the digestive tract.

3. Less frequent plicae semilunaris: True. The ileum has fewer plicae semilunaris (also known as semilunar folds) compared to the jejunum and duodenum.

4. More fat in the mesentery: True. The ileum has more fat in the mesentery compared to the jejunum. The mesentery is a fold of tissue that attaches the intestines to the posterior wall of the abdomen. The fat in the mesentery helps in insulation and protection.