Digestive System

Question 1

What does digest mean?

Answer 1

Digest means to break down large food particles into small food particles

Question 2

Why do we need a digestive system ?

Answer 2

Cells need energy
Food helps us to grow and repair our muscles
We ea food but the particles are to big to enter our cells

Question 3

What a re the parts of the digestive system ?

Answer 3

Mouth , salivary glands , oesophagus , liver , stomach , gall bladder , pancreases , small intestine , large intestine ( colon , rectum , anus )

Question 4

What is the function of the mouth?

Answer 4

Takes in food and chews it

Question 5

What is the function of the salivary glands ?

Answer 5

Produces amylase

Question 6

What is the function of the oesophagus?

Answer 6

Carries food from the mouth to the stomach

Question 7

What is the function of liver?

Answer 7

Produces bile to aid digestion of fat

Question 8

What is the function of the stomach?

Answer 8

Churns food , adds hydrochloric acid to the food

Question 9

What is the function of the gall bladder ?

Answer 9

Stores bile until it is needed in the small intestine

Question 10

What is the function of the small intestine ?

Answer 10

Digests food , absorbs food into blood

Question 11

What is the function of the pancreas ?

Answer 11

Make enzymes to digest food

Question 12

What is the function of the colon?

Answer 12

Absorbs water from food into the blood

Question 13

What is the function of the rectum?

Answer 13

Stores fences for egestion

Question 14

What is the function of the anus ?

Answer 14

Allow faeces to pass from the body (egestion)

Question 15

What is the function of the larger intestine ?

Answer 15

Prepares undigested food for engestion

Question 16

What are the two types of digestion ?

Answer 16

Mechanical digestion , chemical digestion

Question 17

What is mechanical digestion?

Answer 17

Physically breaking down food with teeth
Churning by the stomach

Question 18

What is chemical digestion ?

Answer 18

Enzymes break down larger food molecules into smaller soluble molecules

Question 19

What is peristalsis ?

Answer 19

Peristalsis is a muscular movement that only occurs in the muscles of the digestive system. It causes food to be pushed along the system

Question 20

What is enzymes ?

Answer 20

An enzyme is a chemical found in cells it speeds up chemical reactions

Question 21

What are the 5 steps in the path of food and what they do ?

Answer 21

1. Ingestion - taking in food (eating)
2. Digestion - breaking down the food
3. Absorption - the food passing into the blood system ( for delivery to all cells of the body)
4. Assimilation- the food being put to use by the cells , for example energy , growth , repair
5. Egestion - passing any unabsorbed food out in the form of faeces

Question 22

What are teeth and their functions ?

Answer 22

Molar - chews and grind food
Premolar - chews ad grinds food
Canine - grips and tears food
Incisor - cuts and slices food

Question 23

What is the equipment for the experiment to investigate the digestion of starch by the enzyme amylase ?

Answer 23

Boiling tubes
Starch solution
Water
Enzyme : amylase
Thermometer
Iodine
Dropper

Question 24

What is the method for the experiment to investigate the digestion of starch y the enzyme amylase ?

Answer 24

1. Using a dropper add 5 mls of starch solution to each boiling tube
2. Add 2mls of amylase to the test tube labelled A
3. Add 2mls of water to the test tube labelled B.
4. Place both test tubes in a water bath at 37 degrees for 10 mins
5. Add a few drops of iodine to each test tube.
6. Record your results.

Question 25

What is the result and conclusion of the experiment to investigate the digestion of starch by the enzyme amylase ?

Answer 25

Initial colour of iodine - final colour of iodine :

Starch + water - orange brown , blue black
Starch + amylase - orange brown , orange brown

Amylase breaks down starch into maltose