Download The Stomach & Intestines

Small Intestine
Small Intestine
Most chemical digestion takes
place here
Absorb nutrients
Other organs assist
1st part of the SI is the duodenum
Small Intestine
Villi – tiny fingerlike structures
cover the inner surface of small
intestine; absorbs nutrients into
the blood and carry through the
body
3 organs assist:
(these substances go to the duodenum)
1. Liver
-produces bile
2. Gall bladder
-stores bile
-sends bile to the SI
-bile breaks down fat droplets
3. Pancreas
-produces pancreatic juice & sends to the SI
-has enzymes for starch and protein
-begins chemical digestion of fat
http://www.medicaldoctorratings.com/41-16-Duodenum-L%5B1%5D.gif
Liver
Stomach
Gall
bladder
Duodenum
Pancreas
The small intestine
The small intestine has 3 enzymes to
complete digestion:
 Amylase breaks starch down into
glucose.
 Protease breaks protein down into amino
acids.
 Lipase breaks fats down into fatty acids
and glycerol
Small Intestine has a large surface
area (increases absorption)
The tube is over 6 meters long
The inner wall of the tube has bends in it
The wall is covered in villi (small fingerlike structures)
Outer wall
Inner wall
Pathway
for Food
Absorption 2: Villi
Outer wall
Inner wall
Pathway
for Food