Transcript The Digestive System - Curriculum for Excellence Science

The Digestive System
Materials Required
• Food – bread, banana, sweet corn, coco pops (anything chocolaty will give a
good pooh colour, and we all know sweet corn will make it to the end!)
• Plastic cups – mouths
• Forks – Teeth
• Beakers of water – labelled saliva
• Large sandwich bags – stomach
• Beaker of vinegar + colouring – labelled stomach acid
• Leg of a tight (both ends cut off) – intestines
• Cut off bottle with lid on – rectum and anus
Best to do the squeezing over a sink
These videos will show you how to
do the practical…
https://www.o2learn.co.uk/o2_video.php?vid=435
https://www.o2learn.co.uk/o2_video.php?vid=433
I usually let the learners do it in groups, on a
smaller scale, rather than demo it.
Stage 1
• Put some food in your plastic cup (mouth)
• Chew your food with your fork (teeth)
• Add some water (saliva)
The Oesophagus
How does the food get from the mouth to the stomach?
The Stomach
What happens in the stomach?
How does the stomach help digestion?
Stage 2
• Put the food from the plastic cup (mouth) into
your stomach (plastic bags)
• Add some vinegar (stomach juices)
• Churn your food
The Small Intestine
- Liver
- Gall Bladder
- Pancreas
What is the function of the small intestine?
How is the small intestine adapted to its job?
The Villi
Where is each product of digestion absorbed?
Thin epithelium
Blood Capillaries
Lacteal
The Large Intestine
What is the function of the large intestine?
Rectum and Anus
What is the function of the rectum and anus?
Stage 3
• Pass your food along the tight (intestines)
• Use peristalsis to help absorb the nutrients
and water
Stage 4
• Pass your solid waste into the end of the
bottle (rectum)
• Expel your waste through the bottle top
(anus)
• You might have to squeeze!!!