1. Lesson Starter Name 3 enzymes produced by the pancreas
Draw a diagram of a fat molecule
What does Lipase do?

2. Learning Intention
To be able to explain how food molecules move from the digestive system to the bloodstream

3. Someone’s farted in the class.. Who smells it first?
Think..
Someone’s farted in the class.. Who smells it first?

4. Think, Pair, Share
Explain in terms of particles how the smell gets from one side of the class to the other

5. Diffusion Where there’s A LOT to where there’s NOT.
High to low concentration
Down a concentration gradient
Passive- no energy

6. Diffusion and Digestion
Food broken down into SMALL and SOLUBLE forms
Starch
Protein
Fats
Absorbed in small intestine- DIFFUSION

7. Diffusion and Digestion
Small enough
Small intestine wall to bloodstream
ALOT (in intestine wall) to NOT (bloodstream)

8. Inside the Small Intestine
Structure of intestine helps diffusion
Finger like projections- VILLI
Instructions
Place both squares of mat into a beaker of water and allow to soak for 1 minute
Remove 1 from water and squeeze each beaker
Measure the contents of the beaker using a measuring cylinder
Repeat for second square
Apparatus
2 squares of bathmat
2x beakers
Measuring cylinder

9. The effect of villi on absorption
With Villi
Without villi
Water absorbed (mls)

10. Villi: discuss What effect does the villi have on absorption?
Why is this of benefit?

11. Small Intestine and Diffusion
Villi- Increased surface area
Excellent blood supply
Wall= one cell thick

12. Copy and Complete
Diffusion is the movement of molecules from a region of _______ concentration to a region of _____ concentration.
Small food molecules pass from the wall of the _____ _______ to the __________ by diffusion.
The small intestine has ______ to increase the ________ area.
It has an excellent _______ supply and is _____ cell thick to allow rapid diffusion.

13. Copy and Complete
Diffusion is the movement of molecules from a region of HIGH concentration to a region of LOW concentration.
Small food molecules pass from the wall of the SMALL INTESTINE to the BLOODSTREAM by diffusion.
The small intestine has VILLI to increase the SURFACE area.
It also has an excellent BLOOD supply and is ONE cell thick to allow rapid diffusion.

14. Exit pass
#SmallIntestine
In no more than 140 characters, describe features of the small intestine which help with diffusion.