Organisms - Digestive system

Question 1

Mouth

Answer 1

Digestion of food starts in the mouth. Teeth break down the food and mix it with the enzymes in saliva.

Question 2

Oseophagus

Answer 2

This is a thin tube that connects the mouth to the stomach.

Question 3

Liver

Answer 3

This releases a chemical called bile into the intestines. Bile breaks down lipids in the food.

Question 4

Stomach

Answer 4

This is a muscular bag which mixes food and drink with acid.

Question 5

Pancreas

Answer 5

This releases enzymes into the intestines which break down carbohydrates, protein and lipids in food.

Question 6

Small intestine

Answer 6

Here, carbohydrates, proteins and lipids digest. The nutrients produced are then absorbed into the blood.

Question 7

Large intestine

Answer 7

Food which cannot be broken down - mainly
fibre - passes into the large intestine. Water is absorbed into the blood.

Question 8

Rectum

Answer 8

Any undigested food passes into the rectum where it is stored as faeces.

Question 9

Anus

Answer 9

This is the opening at the very end of the digestive system through which faeces leaves the body.

Question 10

What molecules break down food into nutrients?

Answer 10

Enzymes

Question 11

What type of food is broken down chemically in the mouth?

Answer 11

Carbohydrates

Question 12

Which part of the digestive system releases all three types of enzyme?

Answer 12

Small intestine

Question 13

What is the scientific name for poo?

Answer 13

Faeces

Question 14

Name the process of pushing food along the digestive system.

Answer 14

Peristalsis

Question 15

What are the specialised structures in the small intestine?

Answer 15

Villi