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GCSE Science/Digestion - Wikibooks, open books for an open world

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Digestion begins inside the mouth, where chewing does 2 things - makes the food easier to swallow and increases the surface area (this helps to speed up digestion). Also inside the mouth, amylase (for digesting starch) can be found, produced by the salivary glands.

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We get these by eating them. They are broken down first and then reassembled into our own carbohydrates, proteins and lipids. This is because:

most of the molecules in food are too large to pass through the absorbing surface of the gut wall

the carbohydrates, proteins and lipids are reassembled in the form required, rather than other animal or plant versions

Carbohydrates

Source of energy, glucose is the main respiratory substrate

Starch: potatoes, rice and wheat products, bread, cereals and pasta. Sugars: fruit, smoothies, fizzy drinks, chocolate and sweets

Energy, make up part of cell membranes so essential for normal growth

Butter and margarine, meat and processed meat, plant oils, oily fish, nuts and seeds

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Animal organisation - digestion - AQA - Revision 1 - GCSE Combined Science - BBC Bitesize

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We get these by eating them. They are broken down first and then reassembled into our own carbohydrates, proteins and lipids.

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GCSE Biology Revision "The Digestive System"