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2.2 Food and Digestion

Nutrition and Biochemistry

  • In what type of foods do you find carbohydrates, proteins, lipids (fats and oils), vitamins A, C and D, the mineral ions calcium and iron, water and dietary fibre? What are they each used for in the body?
  • What chemical elements are present in carbohydrates, proteins and lipids?
  • Describe the structure of carbohydrates, proteins and lipids as polymers: starch and glycogen from simple sugar; protein from amino acids; lipids from fatty acids and glycerol.
  • What chemical test would you use for glucose and starch?
  • What should be in a balanced diet?
  • How do energy requirements vary with activity levels, age and pregnancy?
  • Can you explain how to carry out a simple experiment to determine the energy content in a food sample?

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Click here to try a quiz to help you learn about different food groups.

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Click here to try and make a balanced diet for six different people.

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Click here to learn more about the different molecules, proteins, fats and carbohydrates.

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Click here to try and work out how much energy is in different foods using this great activity.

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Click here to learn more about chemical food tests

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Test your knowledge with Quizlet: Nutrition and Biochemistry

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Digestion and Enzymes

  • Can you label a diagram of the digestive system and explain the functions of the mouth, oesophagus, stomach, small intestine, large intestine and pancreas?
  • Can you explain what the following terms mean: ingestion, digestion, absorption, assimilation and egestion?
  • What is peristalsis?
  • Can you explain how digestive enzymes are used to break down starch, protein and fat?
  • Where is bile produced and stored? What are its roles?
  • How do villi aid absorption in the small intestine?

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Watch Mr Exham explain the whole digestive process in this lesson

In the YouTube clip below, Hank takes us through the bowels of the human digestive system and explains why it’s all about surface area.

Click here to see a simple Tim and Moby video that explains how the digestive system works.

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Click here to practice labelling the digestive system.

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Click here to learn more about the organs involved in digestion.

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Click here to take a quiz and learn more about the digestive system.

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Click here to watch an animation that takes you through the digestive system step by step.

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Click here to learn more about how surface area helps absorption in the gut.

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Click here to see how bile is used in the digestive system.

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Click here to learn more about how the small intestine is adapted for absorption.

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Test your knowledge with Quizlet: Digestion and Enzymes

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Extension material

Click here to investigate the various diseases that can affect the digestive system.

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