10. Digestive System

Question 1

4 tunics of alimentary canal:

Answer 1

mucosal layer (inner)
sub-mucosa
muscularis externa
serosal layer (outer)

Question 2

Saliva contains _____ to break down _____

Answer 2

amylase

carbohydate

Question 3

Pepsin in stomach breaks down _____

Answer 3

protein

Question 4

Function of gastric pits:

Answer 4

Gastric pits allow secretions of gastric glands to enter the stomach.
HCl from glandular parietal cells converts pepsinogen (from glandular chief cells) into pepsin in the gastric pit.

Question 5

3 parts of small intestine:

Answer 5

duodenum, jejunum, ileum

Question 6

Pancreatic juice function:

Answer 6

Contains enzymes to breakdown nutrients, and bicarbonate-rich secretion to
neutralise the acidic chyme.

Question 7

4 regions of colon:

Answer 7

ascending, transverse, descending, and sigmoid parts.