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 Lacteal Blood Capillaries

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!!!