Tissues and Organs Flashcards
What is the ileum?
A region of small intestine following the duodenum and is long with a small lumen.
What is the function of the ileum?
Involved in the absorption of the products of digestion and the movement of undigested foods toward the large intestine, it is adapted for absorption.
What are the 5 layers of tissue?
Serosa Mucosa Submucosa Muscularis mucosa Muscularis externa
Explain the role of the mucosa…
It has highly folded lining with numerous villi, base of the villi are crypts which secret mucous and digestive enzymes from Paneth cells. Epithelium is columnar and contains goblet cells which produce protective mucous. Has microvilli which increases the surface area for absorption of digested foods.
Each villus has a network of blood capillaries and a lacteal to absorb fats.
What is the role of the muscularis mucosa?
It allows movement of the villi to enhance diffusion gradients for absorption.
What is the role of the submucosa?
Contains a rich blood supply and lymph vessels to carry absorbed nutrients away from the intestine toward the liver via the hepatic portal vein.
What is the role of the muscularis externa?
It contains two layers of involuntary smooth muscle, these layers work antagonistically to produce wave like contractions known as peristalsis.
What is the role of the serosa?
Contains an outer protective layer of connective tissue, the mesentery connects to the peritoneum and supports the coiled intestine.
