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Identify the locations in the digestive system where amylase, protease, and lipase are produced and where they function.

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Cambridge IGCSE BiologyHuman nutritionCore content

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Identify the locations in the digestive system where amylase, protease, and lipase are produced and where they function

This point belongs to Chemical digestion, especially Chemical digestion outcomes.
You need to be able to identify the locations in the digestive system where amylase, protease, and lipase are produced and where they function.
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Paper 3 structured question: Chemical digestion

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Diagram Description

Digestive system showing enzyme production and action sites

The diagram shows the mouth, stomach, pancreas, and small intestine with labels indicating where amylase, protease, and lipase are produced and where they act.

Enzyme	Produced in	Acts in
Amylase	Salivary glands and pancreas	Mouth and small intestine
Protease	Stomach and pancreas	Stomach and small intestine
Lipase	Pancreas	Small intestine

a
Identify Where is amylase produced?
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
State Where does lipase act?
Your answer
Aim for approximately 1 distinct marking point.
[1]

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Explain that chemical digestion involves breaking down large insoluble molecules into smaller soluble ones.
Chemical digestion outcomes
Identify the importance of chemical digestion in creating small soluble molecules that can be absorbed by the body.
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Outline the roles of enzymes: (a) amylase converts starch into simple sugars, (b) proteases convert proteins into amino acids, (c) lipase converts fats and oils into fatty acids and glycerol.
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Explain the roles of hydrochloric acid in gastric juice, focusing on its ability to kill harmful microorganisms in food and create an acidic environment for optimal enzyme function.
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Describe how starch is digested in the digestive system: (a) amylase breaks starch down into maltose, (b) maltase converts maltose into glucose at the surface of the small intestine's epithelial lining.
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