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Starter

You are a piece of food beginning your journey into the human body, starting in the mouth. Describe your journey through the gut and what happens within each body part you travel through.

Activate Prior Learning

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The Alimentary Canal

Enzymes & Digestion

S3 Biology

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The Alimentary Canal

Learning intentions

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  • To learn about digestion, and the structure and function of the different sections of the alimentary canal.

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Success Criteria

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  • I can identify different structures involved in digestion
  • I can describe the functions of the different structures involved in digestion

LI/ SC

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Solubility of Substances

Large molecules like starch are insoluble.

Smaller molecules like the simple sugars glucose and maltose are soluble.

Think, Pair, Share

Cold Call

What is the difference between soluble and insoluble?

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What is Digestion?

Digestion is the breakdown of large, insoluble food molecules into smaller, soluble molecules which are able to pass through the intestine wall into the bloodstream.

Think, Pair, Share

Cold Call

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Team Task

  • You are going to work together in a team to create a poster about the alimentary canal/digestive system.
  • You will need to explain the physical and chemical interactions (and enzymes) at each stage and what happens to the food in each part of the system.
  • You should include diagrams to show the structures
  • Each person in the group will be an expert for one part of the system and will be responsible for the information for your poster.
    • Mouth & Oesophagus
    • Stomach
    • Pancreas, liver and gallbladder

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Teamwork

Creativity

    • Small Intestine
    • Large Intestine & Rectum

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Checkpoint

  1. What is the name of the tube that connects the back of the throat to the stomach?
  2. What is present in the saliva to assist in the digestion of starch/carbohydrate?
  3. What is the name for the movement of muscles of the gut wall to move food along?
  4. What is the name of the enzyme found in the stomach which digests protein?
  5. What does the liver produce to break down fats?

Demonstrate Success

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You should know

  • Peristalsis is the movement of food along the gut by contraction and relaxation of gut wall muscles.
  • The stomach physically breaks down food by contraction and releases stomach acid and enzymes such as pepsin.
  • The small intestine absorbs digested food into the blood stream.
  • The small intestine is covered in villi to increase the surface area for absorption.
  • The large intestine absorbs water from food.

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The Alimentary Canal

Learning intentions

​

  • To learn about digestion, and the structure and function of the different sections of the alimentary canal.

​

​

Success Criteria

​

  • I can identify different structures involved in digestion
  • I can describe the functions of the different structures involved in digestion

LI/ SC