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Flashcards in Gi Large Intestine Deck (14):
1

What is the Ileocecal sphincter

Maintain positive resting pressure (shut)
Relaxes in response ro distension. Of due
Contracts reoosne to distension of ascending colon to prevent backward flow of fractal matter
Under control vagal nerves, symp neve and enteric nerve s

2

What are the primary functions of the large intestine

Absorption
Secretion
Reservoir
Periodic elim of faeces

3

What does the large ins testing abs

Short chain fatty acids - carbs not abs they are fermented by colonic bac to short chain FA's

ABs of water, sodium a nd chloride

4

What dos the large intestine secrete

Pottasium
Bicarbonate
Mucus
Convert liquid to semi solid faecal matter

5

How is the large intestine a reservoir

Storage of colonic matter

6

Where does the final drying stage occur

Descending and sigmoid

7

Where does most of the fluid reabs and bac fermentation occur

In ascending and transverse

8

What is haustration

Non propulsive segmentation
Caused by contraction of circular muscle

9

What is mass movement

Peristaltic contractions 1-3 times a day
Simultaneous. Not action of large segments of circular muscle of ascendin and transverse

10

What is mass movement triggered by

Gastrocolic repsonse involving
Gastrin
Extrinsic nerve plexuses

11

What does relaxation of skeletal muscle of external anal sphincter vol

Defaecation assisted by abdominal contraction increasing pressure squeezing large intestine and expiration against closed glottis further pressure

12

What kind of process is abs of water

Passive driven by solutes (water follow slat move)

13

How can water move

Trans cellular
Para cell

14

What do here large intestine consist of

Colon - ascending, transverse, descending, sigmoid
Caecum
Appendix
Rectum