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Digestion 01
Teeth break up food into smaller pieces.

Digestion 01

This KS3 Science quiz asks questions about digestion. Digestion is the breaking down of food from being large insoluble molecules into smaller soluble molecules. These smaller molecules can then be absorbed through the lining of the small intestine and dissolved into the blood plasma. The process of digestion begins in the mouth. Chewing breaks down food into smaller lumps and saliva is mixed with the crushed food. Saliva contains an enzyme called amylase. This starts to break down the starches in the food into glucose. Glucose is needed by cells to release energy.

Digestion of proteins starts in the stomach and is completed in the small intestine. The enzyme called protease breaks proteins down into amino acids. These are used by your body for growth and repair.

Fats and oils like butter or olive oil are broken down in the small intestine by a group of enzymes called lipases. As the liquid from the stomach enters the small intestine, bile is added. This emulsifies the fats and oils into small globules which makes it easier for the lipases to digest them. Dietary fibre is mainly cellulose - humans don't have any means of digesting it so it passes through the digestive system.

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1.
Protease breaks down .......
fat
fibre
protein
starch
The names of enzymes usually ends in -ase
2.
Lipase breaks down .......
fat
fibre
protein
starch
They are broken down into fatty acids and glycerol
3.
Which of the following organs is not part of the digestive system?
Gut
Large intestine
Lungs
Small intestine
The lungs are part of the respiratory system
4.
Protein is broken down into .......
amino acids
fatty acids
glucose
glycerol
These are required to make new cells for your body
5.
Which of the following is NOT an enzyme?
Bile
Carbohydrase
Lipase
Protease
Enzymes break down large molecules
6.
Starch is broken down into .......
amino acids
fatty acids
glucose
glycerol
Glucose is a small molecule which is used by cells to release energy
7.
Which of the following organs is not part of the digestive system?
Heart
Liver
Pancreas
Stomach
The heart is part of the circulatory system
8.
Which of the following is NOT a type of tooth?
Canine
Feline
Incisor
Molar
Teeth break up food into smaller pieces
9.
Saliva is mixed with the food. It contains .......
acid
amylase
lipase
protease
Amylase starts the digestion of starch
10.
At which range of temperatures do enzymes work best?
20-30°C
30-40°C
40-50°C
60-70°C
Normal body temperature is 37°C
Author:  Sue Davison

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