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For this experiment, you need guts! Make your own model stomach to demonstrate how the human digestive system works. Just remember to put down a towel... it's a bit messy!

Step 1: Get a grown-up to cut up all the fruit (not the lemon).

Step 2: Mash the fruit chunks with the potato masher.

Step 3: Put the mashed up fruit into your plastic bag.

Step 4: Squeeze the lemon and add the juice to the bag.

Step 5: Leave the bag for 15 minutes to let it 'digest'.

Step 6: Tie the elastic band around the bag and squeeze the fruit through the band.

Be careful! Your plastic bag isn't as strong as your stomach!

Step 7: After you've 'digested' your food, you can put the squished fruit into a glass and drink it as a smoothie. Delicious!

Watch the whole episode of Operation Ouch! Do Try This At Home: Squidgy Stomach on ´óÏó´«Ã½ iPlayer.