Stomach

Question 1

What three areas is the stomach divided into?

Answer 1

The fundus
The body
The antrum

Question 2

What do the fundus and body secrete acid from?

Answer 2

Parietal cells and pepsin precursor, pepsinogen, from peptic cells.

Question 3

What does the astral region of the stomach produce?

Answer 3

Endocrine secretions which control gastric secretion itself as well as gastric motility. These are: Histamine, gastrin and somatostatin.

Question 4

What layers of smooth muscle does the stomach have?

Answer 4

Circular and longitudinal layers as well as an oblique layer that allows distension of the stomach.

Question 5

How is the lining of the stomach protected from acid?

Answer 5

Tight junctions between columnar epithelial cells prevents damage to underlying tissues from acid secretions.
Constitutive secretions of the alkaline mucus layer my mucous cells in the gastric mucosa provides a mechanical barrier to acid secretions and pathogens.