Digestion

What is the digestive system also known as?
Alimentary Canal
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Define Digestion.
The break down of large, insoluble molecules into small, soluble molecules
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What are the two types of digestion?
Mechanical and chemical
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Where does mechanical digestion take place?
In the mouth
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What is the mouth also known as?
The buccal cavity
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What is meant by mastification?
Chewing
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Why does mastification occur?
To increase the surface area of the food to increase the rate of enzyme activity during chemical digestion
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What is a bolus?
A ball of food mixed with saliva
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What is meant by peristalsis?
Muscle contraction to force food along the alimentary canal
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What is meant by chemical digestion?
Using enzymes to hydrolyse large insoluble molecules into smaller soluble molecules
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What type of bond do carbohydrases break?
Glycosidic
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What type of bond do proteases break?
Peptide
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What type of bond do lipases break?
Ester
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What enzyme digests starch?
Amylase
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Where is amylase produced?
In the salivary gland and the pancreas
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What does amylase digest starch into?
Maltose
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What happens to salivary amylase in the stomach?
It is denatured
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What happens in the stomach?
Pepsin digests proteins into amino acids, optimum pH2
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What happens in the duodenum?
Mostly digestion - epithelial cells secrete maltase, lactase and sucrase to break down disaccharides
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What happens in the ileum?
Products of digestion are absorbed by diffusion, facilitated diffusion and active transport
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What are the two parts of the large intestine called?
The colon and the rectum
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What happens in the colon?
Reabsorption of water by osmosis
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What happens in the rectum?
Faeces is stored
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Other cards in this set

Card 2

Front

Define Digestion.

Back

The break down of large, insoluble molecules into small, soluble molecules

Card 3

Front

What are the two types of digestion?

Back

Preview of the front of card 3

Card 4

Front

Where does mechanical digestion take place?

Back

Preview of the front of card 4

Card 5

Front

What is the mouth also known as?

Back

Preview of the front of card 5
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