The Human Digestive System
This lesson covers the structure and function of the human digestive system. Students will learn the pathway food takes through the body, the difference between physical and chemical breakdown, and how nutrients are absorbed into the bloodstream.
Learning objectives
- Identify and describe the functions of the main organs in the human digestive system.
- Distinguish between mechanical and chemical digestion.
- Explain how the small intestine is adapted for the absorption of nutrients.
- Describe the role of enzymes as biological catalysts in digestion.
Lesson plan (60 minutes)
Introduction · 10 min
Retrieval starter: Label the main organs on a human body outline.
Direct Instruction · 15 min
Teacher-led explanation of the journey of food and the role of enzymes.
Guided Practice · 10 min
Interactive 'Digestive Race': Students order cards representing different organs and their functions.
Independent Practice · 15 min
Differentiated worksheet completion (Support, Core, or Stretch).
Plenary · 10 min
8-question multiple choice quiz and self-marking.
Key vocabulary
- Digestion
- The process of breaking down large, insoluble food molecules into small, soluble ones.
- Enzymes
- Biological catalysts that speed up the chemical breakdown of food.
- Mechanical Digestion
- Physical breakdown of food, e.g., chewing in the mouth or churning in the stomach.
- Bile
- A green liquid produced by the liver that breaks down fats into tiny droplets and neutralises stomach acid.
- Villi
- Tiny, finger-like projections on the wall of the small intestine that increase surface area.
Core worksheet (first questions)
- Explain the difference between mechanical and chemical digestion.
- Describe the role of the liver in the digestive process.
- Why are 'villi' important in the small intestine?
- What is the main function of the large intestine?
Quiz (sample)
1. Where does digestion begin?
- A. Mouth
- B. Stomach
- C. Small Intestine
- D. Oesophagus
2. Which tube connects the mouth to the stomach?
- A. Trachea
- B. Oesophagus
- C. Liver
- D. Small Intestine
3. In which organ does most absorption of nutrients occur?
- A. Large Intestine
- B. Stomach
- C. Small Intestine
- D. Liver
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