Nutrition and Digestion: Teacher Resources
A few examples from 'Organisms':
These videos are all screen captures of the 'Organisms' interactive 3D Nutriton and Digestion module, running on a 3D graphics capable PC.
Some of the following videos have soundtracks while others have no sound and are intended as exhibits for teachers to add their own narratives.
The Digestive System
- Digestive System
- Introduces the terminology and anatomical features of the digestive system and the basic principles of nutrition and digestion:
- Two subsystems make up the 'Digestive System'
The Alimentary Canal
Accessory Organs
- The basic principles of digestion:
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The three main food groups are Protein, Carbohydrates and Fats (Lipids)
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Digestion converts these food groups into nutrients, mainly Amino Acids, Sugars and Fatty Acids& Glycerol.
Ingested food is digested as it passes through alimentary canal.
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No food enters any of the accessory organs.
Accessory organs provide chemicals that promote digestion.These compounds are 'secreted' into the alimentary canal. Play Video
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The Digestion Process
- The Four Stages of Digestion
- The Four Stages of the Digestion
Process.
There are four stages to what we understand to be the 'Digestion Process': Ingestion, Digestion, Absorption and Egestion. Play Video
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As food passes through the alimentary canal, it undergoes both Mechanical Digestion and Chemical Digestion.
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Mechanical Digestion crushes, mixes and moves food through the alimentary canal. Play Video
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The contents of the alimentary canal are moved by 'Peristalsis'. Play Video
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Mixing of contents is achieved by 'peristalsis' and 'segmentation' (small Intestine only). Play Video
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Chemical Digestion transforms large insoluble food group molecules into small soluble nutrient molecules that we can asorb.Play Video
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- Mechanical Digestion Makes Chemical Digestion Possible
Chemical Digestion: Enzymes
- Enzymes - A Perfect 'Fit'
- Enzymes are Proteins that accelerate chemical reactions in the body.
- Enzymes are 'Biological Catalysts' and have properties that make them suitable for their role in Digestion:
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Enzymes have unique 'shapes.' Play Video
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Enzymes affect only one 'specific' reaction. Play Video
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Enzymes are sensive to:
- temperature
- pH.
- and can be 'denatured' by both. Play Video
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Enzymes help digest food by 'Hydrolysis.'
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