L17 - Physiology of the Stomach 2 Flashcards
1
Q
What co-ordinates gastric motility
A
- myenteric plexus which receives input from the autonomic nervous system
2
Q
what are the rugae
A
internal folds
3
Q
What does pepsin do
A
hydrolyses proteins to polypeptides and amino acids which stimulate acid production
4
Q
when are pepsin active
what causes them to be inactivated
A
- active in first hour of digestion (10-15%)
- inactivated by a pH above 5
- a large meal can prevent some gastric acid secretion
5
Q
when does salivary amylase act
what does it act on
A
- salivary amylase will act on starch if pH is around 6
6
Q
A
