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You should have a diagram of these in your textbook and/or your notebook. This page
will remind you what happens in each part of your intestines or "Alimentary
Canal".
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Mouth.
- Food and drink goes in and sometimes out of this hole.
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Buccal Cavity = also called the oral cavity = also called the mouth.
- you chew your food, this:
- mixes the food with your saliva.
- breaks it into smaller pieces,
- you taste your food, this:
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Oesophagus = also called the gullet.
- food and drink go down this tube to the stomach
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Stomach
- protein is digested by an enzyme called "pepsin",
- pepsin only works in acid conditions,
- when it is all turned into a liquid it is pushed into the duodenum.
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Duodenum = this is the first part of the small intestine.
- bile from the liver neutralises the stomach acid,
- enzymes from the pancreas digest:
- protein,
- carbohydrate, and
- fats.
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Jejunum = this is the second part of the small intestine = forget it. |
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Ileum = this is the main part of the small intestine.
- the wall of the ileum adds more enzymes,
- digestion of food continues,
- the products of digestion are absorbed.
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Colon = this is the large intestine.
- water is absorbed into the blood,
- fibre is all that is left.
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Caecum: don't worry about this one. |
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Appendix: nothing happens here. |
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Rectum.
- The undigested food (also called faeces) is stored here until you just have to go to the
loo.
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Anus.
- This is a ring of muscle which is normally contracted.
- It is relaxed to let the faeces out.
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I hope that you have read through this page and that it all makes sense; so what should
you do now ?
You will need 7 index cards. Number the cards 1 to 7. and write the following
names on them:
- Buccal Cavity (mouth)
- Oesophagus (gullet)
- Stomach
- Duodenum (small intestine)
- Ileum (small intestine)
- Colon (large intestine)
- Rectum
Now write the same numbers on the back of each card and write down what each part does.
Finally, add the cards to your revision pack.
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