Overview Of GI Physio Flashcards
For open type EECs, where does sensing generally occur?
Apical membrane. It is also where it is in contact with the lumen
For open type EECs, where does secretion generally occur?
Basolateral membrane
Difference between open-type and closed-type EECs?
The former has contact with the lumen which the latter does not have
T/F. Enterochromaffin-like cells in the intestinal epithelium secretes histamine.
False. Should be gastric epithelium not intestinal epithelium
T/F. Auerbach’s plexus is between outer longitudinal muscle and submucosa?
False. It is between the outer longitudinal and inner circular muscles
T/F. The Meissner plexus is between the outer longitudinal muscle and submucosa.
False. It is between the inner circular muscle and submucosa
T/F. The enteric nervous system allows GIT to function even when sympathetic nerve supply is cut-off.
True. Even if sympathetic AND/OR parasympathetic nerve supply is cut-off, GIT will still function because of ENS (Berne and Levy)
T/F. Histamine stimulates production of acid by parietal cells through exocrine regulation.
False. It is by paracrine regulation
T/F. In Neurocrine Regulation, vagus nerve stimulation releases epinephrine that causes HCl release by parietal cells.
False. Acetylcholine is released
Main difference between cephalic and oral phases?
In the oral phase, food is actually in contact with the oral mucosa
T/F. Secretagogues mediate secretion thru paracrine regulation only.
False. Either of the 3 regulatory mechanisms (paracrine, endocrine, and neurocrine)
T/F. Both organic and inorganic secretory components are region/gland specific.
True
Major secretion of sublingual gland?
Mucus
Major secretion of submandibular gland?
Mixed
Major secretion of parotid gland?
Serous
