What is the function of the teeth Key vocabulary digestive system nutrition mouth teeth saliva oesophagus gullet stomach small intestine large intestine rectum anus faeces Grab a small piece of an apple a cracker or something else to nibble on Take a small bite and chew it u ID: 927048
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Slide1
What is the first stage of the digestive system?
What is the function of the teeth?
Slide2Key vocabulary
digestive system
nutrition mouth
teeth
saliva
oesophagus (gullet)
stomach
small intestine
large intestine
rectum
anus
faeces
Slide3Grab a small piece of an apple, a cracker or something else to nibble on. Take a small bite and chew it up. How long do you think it took to get to your stomach? Tell an adult your answer.
Slide46 Seconds!
What if you were upside down – would it take a different amount of time?
Still about 6 seconds – but I wouldn’t recommend trying!
Slide5Food is moved along the
oesophagus (food pipe or gullet) between the mouth and the stomach by the muscles around it. They move in a worm-like motion called peristalsis and push the food towards the stomach.
Slide6A digestive system experiment using household objects
orange = acid in the stomach
Water = saliva
Cream crackers = food
Banana =food
Metal tray = body
A sealed plastic bag = stomach
Pair of tights = small intestine
Watch this experiment so you can visualise the process of digestion.
https://www.stem.org.uk/resources/elibrary/resource/35396/digestive-system-experiment
Slide7The Stomach
The acids and enzymes in the stomach break down the food. The muscles surrounding it contract to help churn up the food.
oesophagus
stomach
small intestine (ileum)
Slide8The Small Intestine
The partially digested food then moves from the stomach to the small intestine. It takes about 20 minutes for your chewed up food to travel from your mouth to here. The small intestine does most of the work – almost all of the digestion and absorption of nutrients and minerals happens here. The remains of the food move along the intestine by peristalsis, just like it does through the oesophagus. It is about 7 metres long!
Slide9The Large Intestine
If the small intestine is 7 metres long, how long do you think the large intestine is?
It is actually only 1.5 metres long. It is called the large intestine because it is a lot wider than the small intestine. It is the final stage of the digestive system. The last of the water is absorbed, and the waste hardens and forms faeces (poo).
large intestine
small intestine
Slide10What is the result of a healthy digestive system?
A healthy body!Your digestive system turns the food you eat in to the fuel that your body needs.
Slide11Main task
Look at the worksheet. Name the parts of the digestive system and explain their function.
Note:
Rather than printing the worksheet you could copy this drawing of the digestive system and then complete the labelling and describing of the parts and function afterwards.
Slide12Challenge: