Gut structure

• Mucosa• Submucosa• Muscularis externa• Serosa

• Regarding the PH range is as the following

• A) For buccal cavity the PH is approximately 7• B) Esophagus PH is 5-6• C) Stomach PH is 1-3, decomposition of some drugs occurs here

& weak acids are un-ionized• D) Duodenum PH is 6-6.5 contains ducts & surfactant properties• E) Small Intestine PH is around 7-8• F) Large Intestine PH is about 5.5-7

pH of the Gastrointestinal Contents of Various Species∗

Regarding the Surface Area

A)Buccal cavity, esophagus & stomach have a small

surface area

B) Duodenum have a very large surface area

C) Small intestine have a very large 10-14 ft

D) The large intestine doesn’t have very large area,

about 4-5 ft

Regarding the Transit Time

A) Buccal Cavity have a short unless controlled timeB) Esophagus have a short timeC) Stomach have 30-40 minutes (small time) with reduced absorptionD) Duodenum have a very short window effectE) The small intestine have about 3 hoursF) The large intestines have a long one up to 24 hours

Regarding the Transit Time

A) Buccal Cavity have a short unless controlled timeB) Esophagus have a short timeC) Stomach have 30-40 minutes (small time) with reduced absorptionD) Duodenum have a very short window effectE) The small intestine have about 3 hoursF) The large intestines have a long one up to 24 hours