Lecture 6

Question 1

Large Intestine

Answer 1

Completes absorption of nutrients and water, forms faecal material, & helps synthesize some vitamins
Contains bacteria that aid in function

Question 2

Regions of the large intestine:

Answer 2

Cecum, ascending colon, transverse colon, descending colon, sigmoid colon, rectum, & anus
Appendix is attached to cecum

Question 3

Question 4

Flexures are bends in the large intestine
Left colic & right splenic flexures
Rectum holds faecal material until eliminated
Internal & external anal sphincters regulate release of faeces
Internal anal sphincter is smooth muscle; external anal sphincter is skeletal muscle

Question 5

Taeniae coli

Answer 5

extend the length of large intestine

Question 6

Contractions form

Answer 6

haustra

Question 7

Motility in large intestine

Answer 7

Haustral contractions—aid in water absorption
Mass movement—forces contents toward rectum
Gastrocolic reflex—gastric activity increases colon activity
Valsalva’s manoeuvre—increased abdominal pressure aids in faecal elimination