Digestive system

Question 1

What is the function of the anus?

Answer 1

Receives and holds stool until excretion, signals the need to do so

Question 2

What is the function of the large intestine?

Answer 2

Connects small intestine to rectum, processes waste, absorbs water into blood

Question 3

What is the function of the gall bladder?

Answer 3

Stores excess bile

Question 4

What is the function of the liver?

Answer 4

Processes absorbed food, detoxifies blood, produces bile

Question 5

What is the function of the stomach?

Answer 5

Churns food and breaks it into small pieces. Contains HCl to kill ingested bacteria

Question 6

What is the function of the oesophagus?

Answer 6

Carries food to stomach

Question 7

What is the function of the mouth?

Answer 7

Chews food to break it down

Question 8

What is the function of the small intestine?

Answer 8

Absorbs smaller, soluble products into blood

Question 9

Which chemicals are produces by the pancreas?

Answer 9

Protease, carbohydrase, lipase, insulin

Question 10

Which chemicals are produced in the stomach?

Answer 10

Protease (pepsin), HCl

Question 11

Which chemicals are produced in the small intestine?

Answer 11

Protease, lipase, amylase

Question 12

Which chemicals are produced in the mouth?

Answer 12

Amylase

Question 13

Which chemicals are produced in the liver?

Answer 13

Bile

Question 14

What is the function of bile?

Answer 14

Neutralise hydrochloric acid, emulsifies fats

Question 15

How do you test for starch?

Answer 15

1. Put a small piece of food on a white tile
2. Add 2 drops of iodine to it
3. Positive if iodine goes blue-black colour

Question 16

How do you test for protein?

Answer 16

1. Mix small sample with 3ml of biuret solution
2. Leave for 2 minutes
3. Positive if lilac colour

Question 17

How do you test for glucose?

Answer 17

1. Mix a sample of food with 3ml of benedict’s solution in a boiling tube
2. Heat in hot water bath for 3 minutes
3. Positive if mixture goes tomato red colour

Question 18

What 2 things do you test for when testing for carbohydrates?

Answer 18

Starch and reducing sugars.

Question 19

How do you test for lipids?

Answer 19

1. Mix small sample with 1ml of ethanol in a dry test tube
2. Pour ethanol into a test tube with 10ml of cold water
3. Positive if water goes cloudy white

Question 20

What are enzymes?

Answer 20

Proteins; biological catalysts that break down food molecules