The Digestive System And Enzymes

Question 1

What is digestion?

Answer 1

Digestion is the breakdown of large insoluble food molecules into small soluble food molecules

Question 2

Name and explain the two types of digestion

Answer 2

Physical - where food is broken down by the teeth and by the churning action of the muscles in the digestive system

Chemical - where the food is broken down by enzymes

Question 3

What are enzymes? Give an example of one

Answer 3

Biological catalysts - Amylase

Question 4

What is the name of a substance an enzyme acts on?

Answer 4

Substrate

Question 5

How do you investigate the action of amylase on starch

Answer 5

1. Have 2 test tubes of starch and amylase and 2 test tubes of starch and water.
2. Boil all test tubes in water for 5 minutes
3. Test a tube of starch and amylase and a tube of starch and water for the presence of starch using iodine solution. The starch and amylase tube should have no starch
4. Test a tube of starch and amylase and a tube of starch and water for the presence of a reducing sugar with Benedict’s Solution. The starch and amylase tube should show the presence of a reducing sugar

Question 6

Name the 4 stages of nutrition in order

Answer 6

EDAG

Eating
Digestion
Absorption
Getting rid of waste

Question 7

What is the function of the liver?

Answer 7

Produces bile and helps digestion of fats. It sorts and stores some digested food

Question 8

What is the function of the pancreas?

Answer 8

Produces digestive enzymes

Question 9

What is the function of the large intestine?

Answer 9

Takes water back into the bloodstream leaving solid waste

Question 10

What is the function of the small intestine?

Answer 10

More juices containing enzymes are added to help digest the food. Fully digested food is absorbed into the bloodstream

Question 11

What is the function of the stomach?

Answer 11

Produces digestive juices