THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -In the small intestine, absorption occurs through the lumenal face of the mucosa, which is covered with finger-like projections called villi . Each villus is bordered by several pouches or invaginations called crypts. On the average, each villus is surrounded by eight crypts.

Detailed explanation-2: -Phosphate absorption occurs primarily in the small intestine and its relative efficiency is greater in the duodenum, followed by the jejunum, and then the ileum [22]. The majority of phosphate is absorbed in the jejunum due to its greater length.

Detailed explanation-3: -The small intestine has a vast interior surface area, which makes it good for absorption. This is created by the plicae circulares, which project numerous microscopic tissue structures that resemble fingers and are known as villi.