Small IntestineSmall Intestine

Small IntestineSmall IntestineMost chemical digestion takes Most chemical digestion takes place hereplace here

Absorb nutrientsAbsorb nutrients

Other organs assistOther organs assist

11stst part of the SI is the duodenum part of the SI is the duodenum

Small IntestineSmall Intestine

VilliVilli – tiny fingerlike structures – tiny fingerlike structures cover the inner surface of small cover the inner surface of small intestine; absorbs nutrients into intestine; absorbs nutrients into the blood and carry through the the blood and carry through the bodybody

3 organs assist:3 organs assist:(these substances go to the duodenum)(these substances go to the duodenum)

1.1. LiverLiver

-produces bile-produces bile

2.2. Gall bladderGall bladder

-stores bile-stores bile

-sends bile to the SI-sends bile to the SI

-bile breaks down fat droplets-bile breaks down fat droplets

3.3. PancreasPancreas

-produces pancreatic juice & sends to the SI-produces pancreatic juice & sends to the SI

-has enzymes for starch and protein-has enzymes for starch and protein

-begins chemical digestion of fat-begins chemical digestion of fat

http://www.medicaldoctorratings.com/41-16-Duodenum-L%5B1%5D.gifhttp://www.medicaldoctorratings.com/41-16-Duodenum-L%5B1%5D.gif

Liver

Gall bladder

Duodenum

Pancreas

Stomach

The small intestineThe small intestineThe small intestine has 3 enzymes to The small intestine has 3 enzymes to complete digestion:complete digestion: AmylaseAmylase breaks breaks starchstarch down into down into

glucoseglucose.. ProteaseProtease breaks breaks proteinprotein down into down into amino amino

acidsacids.. LipaseLipase breaks fats down into breaks fats down into fatty acidsfatty acids

and and glycerolglycerol

Small Intestine has a large surface Small Intestine has a large surface area (increases absorption)area (increases absorption)

The tube is over 6 meters longThe tube is over 6 meters long

The inner wall of the tube has bends in itThe inner wall of the tube has bends in it

The wall is covered in villi (small finger-The wall is covered in villi (small finger-like structures)like structures)

Outer wall

Inner wall

Pathway for Food

Absorption 2: VilliAbsorption 2: Villi

Outer wall

Inner wall

Pathway for Food