Question

The definition for the medical term ileum is__________

1) pertaining to the armpit
2) large wing-shaped bone at the upper and posterior part of the pelvis
3) sticky secretion of cells in mucous membranes
4) a thin wall separating two cavities or two tissue masses
5) third portion of the small intestine

Answer 1

The ileum is the third section of the small intestine, specialized in absorbing vitamin B12, bile salts, and remaining nutrients, and is marked by a greater development of mucosal folds compared to the jejunum.

Step-by-step explanation:

The ileum is defined as the third portion of the small intestine. It is the part of the small intestine that is responsible for the absorption of vitamin B12, bile salts, and other nutrients not already absorbed by the jejunum. The ileum is approximately 1.8 meters (6 feet) long and is characterized by its thicker walls, increased vascularity, and more developed mucosal folds compared to the jejunum. Inside the ileum, peristaltic movements help to move undigested food into the large intestine, beginning at the ileocecal valve. An important feature of the small intestine, the ileum's inner surface is lined with villi that greatly increase the surface area for nutrient absorption.