GCSE Biology Revision — Digestive System
Revise Digestive System for GCSE Biology with a topic explanation, worked example and common mistakes. Check the board notes for specification differences.
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What is Digestive System?
The digestive system is an organ system that breaks down large, insoluble food molecules into smaller, water-soluble molecules that can be absorbed into the bloodstream. This process involves both mechanical digestion (chewing, churning) and chemical digestion by enzymes. Key organs include the stomach, small intestine, and large intestine.
Board notes: Covered by all major boards (AQA, Edexcel, OCR). The roles of specific enzymes (amylase, proteases, lipases) and the adaptations of the small intestine are key areas.
Step-by-step explanationWorked examples
Worked example
A piece of bread (starch) is eaten. In the mouth, amylase in saliva begins breaking it down into smaller sugars. In the stomach, it's mixed with acid. In the small intestine, more amylase from the pancreas, and maltase from the intestine wall, break it down into glucose, which is then absorbed into the blood.
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Common mistakes
- 1Confusing the small and large intestine's functions. The small intestine is the primary site for chemical digestion and absorption of nutrients, while the large intestine mainly absorbs water from undigested food.
- 2Forgetting the role of the liver and pancreas. The liver produces bile to emulsify fats, and the pancreas produces digestive enzymes; they are crucial accessory organs.
- 3Thinking digestion is just about the stomach. Digestion starts in the mouth with saliva and continues through a long, complex system, with the majority of absorption happening in the small intestine.
Digestive System exam questions
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Frequently asked questions
What is the function of the stomach?
The stomach pummels food with its muscular walls, produces protease enzyme (pepsin) to start protein digestion, and contains hydrochloric acid to kill bacteria and provide the optimal pH for pepsin to work.
How is the small intestine adapted for absorption?
The small intestine is very long and has a highly folded surface with millions of tiny projections called villi and microvilli. This creates a massive surface area for the efficient absorption of digested food molecules.