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

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

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

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

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

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

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

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

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

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

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

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.

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.

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