Physio- Colon

Question 1

What are the 2 main movements of the colon?

Answer 1

Haustrations and mass movements

Question 2

What happens to poop when Haustrations happen?

Answer 2

It’s mixed (it’s like segmentation of the SI)

Question 3

What happens to poop when mass movements occur?

Answer 3

It’s moved forward through the colon (like peristalsis in the GI)

Question 4

Which 2 intestinal reflexes increases mass movements in the colon?

Answer 4

Gastrocolic and duodenocolic

Question 5

When poop causes stretching of the rectum, which sphicter is relaxed? Internal or external?

Answer 5

Internal anal sphincter

Question 6

So how do you get poop out from your rectum?

Answer 6

Relaxation of the external anal sphincter

Question 7

True or False: the defectation reflex is strong by having the myenteric reflex have mass movements in the colon.

Answer 7

False, you need PANS from the sacral spinal cord to have a good bowel movement.

Question 8

Is the external anal sphincter composed of voluntary striated muscle or involuntary smooth muscle?

Answer 8

Strated muscle! Rememebr this is the 1 u voluntarily relax when you’re ready to poop.

Question 9

Which nerve innervates the external anal sphincter?

Answer 9

Pedendal n.

Question 10

The crypts pof Lieberkuhn secrete what substances in the colon?

Answer 10

Mucus and some bicarb

Question 11

What determines the rate of mucus production fotkm the crypts of Lieberkuhn in the colon?

Answer 11

tactily stimulation of the epithelial cells in the colon and by local nerve reflexes.

Question 12

What happens if the colon is irritated?

Answer 12

The body secretes a large amt of water/electrolytes/mucus –> diarrhea

Question 13

The colon is a large place for the absorption of what substance?

Answer 13

Water

Question 14

First, the colon must absorb what substance in order to absorb water?

Answer 14

NaCl

Question 15

The over-absorbtion of fluid in the gut can cause what complaint?

Answer 15

Constipation

Question 16

What is the other cause of constipation (think tumors and adhesions and ulcers)?

Answer 16

Obstructions

Question 17

Why can constipation occur later in life if kids don’t develop good bowel habits?

Answer 17

Progressive decrease of reflex strength

Question 18

This is the cause of diarrhea when irritation from infection causes extensive secretion and increased motility in order order to propel the irritant.

Answer 18

Enteritis

Question 19

This type of diarrhea is from the triggering by nervousness causing excess stimulation of the PANS.

Answer 19

Psychogenic diarrhea

Question 20

This conditions is when the walls of the colon are inflammed and ulcerated, causing excess secretions and mass movements throughout the day.

Answer 20

Ulcerative colitis

Question 21

What is flatus?

Answer 21

Fart

Question 22

What are the 3 sources of farts?

Answer 22

1. swallowed gas. 2. bacterial products. 3. gases from the blood.