Small intestine is a long tube, with a small diameter (about 1 inch), extending from pyloric sphincter to the ileocecal valve and divided into duodenum, jejunum, and ileum.
The jejunum is located centrally in the abdomen, whereas the ileum lies mostly in the hypogastric region and pelvic cavity.
The jejunum makes up two-fifths of the total length of the small intestine and is about 0.9m in length. It starts at the duodenojejunal flexure and ends at the ileum.
The main function of the jejunum is absorption of important nutrients such as sugars, fatty acids, and amino acids.
It plays an important role for digestion as 40% of the whole small intestine is jejunum. Its functions include absorbing water and nutrients.
Absorption occurs at and is facilitated by numerous one to two cell layer thick fingerlike projection on the surface mucosa (villi) via active passive transport mechanisms. Absorption lipid breakdown product occurs mostly by passive diffusion protein-mediated processes.
Jejunum: Middle of the three parts of the small intestine
What does the term "diet" mean? The definition of a diet as the complete oral consumption of nutrients and non-nutritive substances is comprehensive yet lacks specificity. It is defined by the typical composition and allocation of nutrients and foods ingested by an individual or a specified group.
Friday, July 02, 2021
Jejunum: Middle of the three parts of the small intestine
Labels:
absorption,
jejunum,
nutrients,
small intestine
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