Introduction to the GIT

Question 1

What type of cells are found in the epithelium?

Answer 1

Stratified squamous cells

Question 2

Name the four layers of the GIT starting from the lumen

Answer 2

Mucosa, sub-mucosa, muscularis externa, adventitia/serosa

Question 3

What is the extrinsic innervation in the GIT?

Answer 3

Autonomic NS (sympathetic and parasympathetic)

Question 4

What is the intrinsic innervation in the GIT?

Answer 4

Enteric NS (myenteric nerve plexus and submucosal nerve plexus)

Question 5

Is the parasympathetic NS excitatory or inhibitory?

Answer 5

Excitatory ACh

Question 6

Is the sympathetic NS excitatory or inhibitory?

Answer 6

Inhibitory (NA)

Question 7

What is the role of the submucosal nerve plexus?

Answer 7

secretion, blood flow regulation

Question 8

What is the role of the Myenteric nerve plexus?

Answer 8

Motility