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Human Nutrition (The digestive system (Human digestive system, Mouth -…
Human Nutrition
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Stages of digestion
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Digestion - The breaking down of large, insoluble molecules and breaking them down into small, soluble ones.
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Assimilation - Taking digested products from eating and building your own cells and tissues out of them.
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Bile
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The hydrochloric acid in the stomach makes the pH too acidic for enzymes to work properly. Bile is alkaline - it neutralises the acid and makes conditions alkaline. Enzymes in the small intestine work best in these alkaline conditions.
Bile also emulsifies fats. This gives a much larger surface area of fat for the enzyme to work on - which makes digestion faster.
Emulsification - the break down of large droplets into small droplets, increasing the surface area.
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Peristalsis
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The muscles contract to help the food. This process occurs throughout the gut. It helps to mix the food with digestive juices.
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