Enzymes and Digestion (Pages 22-23)

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What do digestive enzymes do?
Break down big molecules into smaller molecules
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Name three big molecules involved in the digestive system
Starch, proteins and fats
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Name four small molecules involved in the digestive system
Sugars, amino acids, glycerol and fatty acids
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What does amylase do?
Convert starch into sugars
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Where is amylase used?
In the salivary glands, pancreas and the small intestine
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What does protease do?
Convert proteins into amino acids
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Where is protease used?
In the pancreas, small intestine and stomach
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What is protease in the stomach called?
Pepsin
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What does Lipase do?
Convert lipids into glycerol and fatty acids
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Where does lipase work?
In the pancreas and small intestine
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What enzyme do the salivary glands produce and where?
Amylase in the saliva.
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Where is bile produced and stored?
Bile is produced in the liver and stored in the gall bladder
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What does bile do?
Neutralise stomach acid and emulsify fats
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Is bile an alkaline or an acid?
Alkaline
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Why is it useful for bile to emulsify fats?
It gives a bigger surface area of fat for the enzyme lipase to work on - digestion is quicker
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What acid does the stomach produce?
Hydrochloric acid
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What two reasons does the stomach use hydrochloric acid for?
To kill bacteria and to give the right pH for protease to work (pH 2) acidic.
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What happens in the large intestine?
Excess water is absorbed from the food
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What happens in the small intestine?
Digested food is absorbed out of the digestive system and into the blood.
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Other cards in this set

Card 2

Front

Name three big molecules involved in the digestive system

Back

Starch, proteins and fats

Card 3

Front

Name four small molecules involved in the digestive system

Back

Preview of the front of card 3

Card 4

Front

What does amylase do?

Back

Preview of the front of card 4

Card 5

Front

Where is amylase used?

Back

Preview of the front of card 5
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