Digestive System

Question 1

Mouth and Salivary Glands

Answer 1

Food is ingested and teeth break it down into smaller pieces

Saliva is secreted into the mouth

The enzyme amylase in begins to digest starch into maltose

Question 2

Stomach

Answer 2

Protease enzymes begin protein digestion

Hydrochloric acid provides a suitable pH for enzymes and destroys any pathogens in food

Question 3

Liver

Answer 3

Bile salts are produced here

Bile salts aid the digestion of lipids, as well as neutralising stomach acid as it exits the stomach

Question 4

Pancreas

Answer 4

Amylase, protease and lipase enzymes are produced here before being released into the duodenum

Question 5

Small intestine: duodenum

Answer 5

The acidic stomach contents are neutralised by bile and become slightly alkaline

Enzymes complete chemical digestion here

Question 6

Small intestine: ileum

Answer 6

Food and water are absorbed into the blood via villi in the lining of the ileum

Question 7

Emulsification

Answer 7

Breaking down of large lipids through bile salts binding and splitting them