Digestive System

Question 1

Mouth cavity

Answer 1

Teeth and salivary gland

Question 2

Stomach

Answer 2

Muscle layer of stomach wall

Gastric gland

Question 3

Small intestine

Answer 3

Pancreas
Liver
Muscle layer of intestinal wall
Intestinal gland 
On the cell membrane of the epithelial cells

Question 4

Teeth

Answer 4

Physical

Mastication breaks down food into smaller pieces

This makes swallowing easier

This also increase the surface area of food for the action of enzymes

Question 5

Salivary gland

Answer 5

Saliva

Mucus
Lubricate the food for easier swallowing

Salivary amylase (chemical)
Break down starch into maltose

Question 6

Muscle layer of the stomach wall

Answer 6

Physical

Churning action of the stomach breaks food into smaller pieces

This helps increase the surface area of food for the action of enzymes

This also helps mix food with the digestive enzymes

Question 7

Gastric gland

Answer 7

Gastric juice

Mucus
Protect the stomach from self-digestion

Hydrochloric acid
Provide an acidic medium for enzymes to work
Kill bacteria

Protease (chemical)
Break down protein into peptides

Question 8

Pancreas

Answer 8

Pancreatic juice

Amylase (chemical)
Break down starch into maltose

Lipase (chemical)
Break down fat into fatty acid and glycerol

Protease (chemical)
Break down protein/peptides into amino acids

Sodium hydrogencarbonate
Neutralise acid from gastric juice
Provide an alkaline medium for enzymes to work

Question 9

Muscle layer of the intestinal wall

Answer 9

Physical

Peristaltic contraction of the muscle layer pushes food through along the intestine

This also helps mix food with digestive enzymes

Question 10

Intestinal gland

Answer 10

Intestinal juice

Sodium hydrogencarbonate
Neutralise the acid from gastric juice
Provide an alkaline medium for enzymes to work

Question 11

On the cell membrane of epithelial cells

Answer 11

Carbohydrase (chemical)
Break down disaccharides into monosaccharides

Protease (chemical)
Break down peptides into amino acids

Question 12

Liver

Answer 12

Bile (produced in liver, stored in gall bladder)

Bile salts (physical)
Emulsify lipids into droplets such that there is an increase in surface area for the action of lipase 

Sodium hydrogencarbonate
Neutralise the acid from gastric juice
Provide an alkaline medium for the work of enzymes