5. • 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
6. pH of the Gastrointestinal Contents of
Various Species∗
7. 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
8. Regarding the Transit Time
A) Buccal Cavity have a short unless controlled
time
B) Esophagus have a short time
C) Stomach have 30-40 minutes (small time)
with reduced absorption
D) Duodenum have a very short window effect
E) The small intestine have about 3 hours
F) The large intestines have a long one up to 24
hours
9. Regarding the Transit Time
A) Buccal Cavity have a short unless controlled
time
B) Esophagus have a short time
C) Stomach have 30-40 minutes (small time)
with reduced absorption
D) Duodenum have a very short window effect
E) The small intestine have about 3 hours
F) The large intestines have a long one up to 24
hours
