The Digestive System

Question 1

What are the 5 stages of digestion

Answer 1

Ingestion
Digestion
Absorption
Assimilation
Egestion

Question 2

What happens in ingestion and what organs are involved

Answer 2

The food is taken in through the mouth
Mouth

Question 3

What happens in digestion and what organs are involved

Answer 3

The food is broken down into soluble substances
Stomach ,small intestine ,mouth

Question 4

What happens in absorption and what organs are involved

Answer 4

The soluble products are absorbed into the bloodstream and transported round the body.
Small intestine (ileum)

Question 5

What happens in assimilation and what organs are involved

Answer 5

The soluble products of digestion are taken into the cells where they are used
Every cell in your body

Question 6

What happens in egestion and what organs are involved

Answer 6

Removal of waste food (defecation)
Anus

Question 7

What is mechanical digestion

Answer 7

It happens in the mouth as our teeth cut and grind the food into smaller pieces. This increases the surface area. It is also happening in the stomach as its muscular walls churn the food.

Question 8

What is chemical digestion

Answer 8

starts in the mouth and continues in the stomach and small intestine. It involves breaking the chemical bonds in the large molecules resulting in the formation of smaller molecules. Enzymes are responsible for chemical digestion.

Every enzyme is specific. This means they can only carry out one reaction therefore we need different enzymes to digest the different types of food molecule.

Question 9

What are all the organs used in digestion?

Answer 9

Mouth
Oesophagus
Stomach
Pancreas
Bile duct
Diaphragm
Liver
Gall bladder
Duodenum
Small intestine (ileum)
Large intestine (colon)
Appendix
Rectum
Anus

Question 10

What happens in the mouth?

Answer 10

Food is chewed
Saliva contains amylase to digest carbohydrates

Question 11

What happens in the oesophagus?

Answer 11

Muscular tube that pushes food along by peristalsis

Question 12

What happens in the stomach?

Answer 12

Mechanical (churning) and chemical (enzymes)
Digestion occurs here
Acid is produced to kill bacteria

Question 13

What happens in the small intestine? (Ileum)

Answer 13

Absorption occurs
It is long, folded and has villi

Question 14

What happens in the anus?

Answer 14

Egestion occurs

Question 15

What happens in the large intestine (colon)

Answer 15

Water is reabsorbed

Question 16

What happens in the rectum?

Answer 16

Faeces are stored

Question 17

What does saliva do

Answer 17

Breaks down the food because it contains amylase