Page 278 - Color_Atlas_of_Physiology_5th_Ed._-_A._Despopoulos_2003
P. 278
A. Mass movement in large intestine
Barium
meal Food
1 2 3 4
7:00 a.m. 12 noon 12:15 p.m. 12:20 p.m. Large Intestine, Defecation, Feces
5 6 7 8
Plate 10.20
12:21 p.m. 12:25 p.m. 12:25 p.m. 12:26 p.m.
(After Hertz & Newton)
B. Anal closure and defecation
Relaxed Ab-
Rectal ampulla dominal Contracted
pressure
Kohlrausch’s
fold Circular muscles Stretch Circular muscles
receptors
Contracted Relaxed
Puborectal
muscles
Internal Rectum
anal sphincter shortens
External
Venous Puborectal
spongy body muscles relaxed
1 Anus closed 2 Urge to defecate 3 Defecation
C. Composition of feces
1.0
0.76 Water Inorganic substances 0.33
0.33
N-containing substances
0.24
0.08 Intestinal epithelium cells 0.17
Cellulose, etc.
0.08 Bacteria
0.17
0.08 Food residue Lipids
0 265
Feces (60–180g/day=1.0) Dry matter (25–40g/day=1.0)
Despopoulos, Color Atlas of Physiology © 2003 Thieme
All rights reserved. Usage subject to terms and conditions of license.
