Observing a Permanent Slide of T.S. of the Ileum Under the Microscope
Observing a Permanent Slide of T.S. of the Ileum Under the Microscope.
Adaptations of the Small Intestine
- Presence of villi provides a large surface area for the absorption of food
- Great length provides a large surface area for absorption of food.
- Each villus has a wall one cell thick for easy diffusion
- Villi are rich in blood capillaries for the transport of absorbed food.
- Villi are in constant movement, keeping digested food in contact for absorption.
Parts and Functions.
Serosa:
- The outermost layer.
Functions of serosa:
- Suspends the gut to the abdominal wall.
- Secretes a lubricant to prevent friction
- Longitudinal and circular muscles are smooth muscles.
- They are collectively referred to as the muscularis externa.
- Produce peristalsis.
Submucosa:
- Contains blood and lymphatic vessels
Function:
- Transport absorbed food.
Muscularis mucosa:
- A strand of muscles between the submucosa and mucosa
Function:
- Its contractions help to release intestinal fluid from intestinal glands into the lumen
Mucosa:
- The innermost layer
- Contains intestinal glands
- Folded into finger-like projections called villi
- Its surface, for that matter, the surface of villi is lined with epithelium, which secretes mucus to prevent friction
Functions:
- Secretes mucus to lubricate food
- Villi absorb digested food
