Function of oesophagus in digestion process

Function of the oesophagus in digestion process
which of the following could NOT be used to describe pepsinogen?
A. it is a protein
B. it is a hormone
C. it is related to an enzyme
D. it is inactive
Answer is B: Pepsinogen is an inactive protein enzyme. But it is not a
42. What is the function of the oesophagus in digestion?
A. It is a site of mechanical digestion.
B. It transfers food from the mouth to the stomach.
C. The oesophagus secretes amylase to begin carbohydrate digestion.
D. the oesophagus secretes hydrochloric acid.
Answer is B: It is merely a conduit to transfer food from the mouth to the
stomach while bypassing the thoracic structures.
43. What is the purpose of the mucosal barrier between the cells of the stomach
wall and the stomach contents?
A. It prevents the enzymes in the stomach contents from digesting the
B. It converts pepsinogen to its active form.
C. It prevents bacteria in the stomach from invading the stomach wall.
D. It prevents undigested food molecules from being absorbed by the stom-
ach lining.
Function of the oesophagus in digestion process
Answer is A: The stomach contents include the enzyme pepsin and hydro-
chloric acid, both of which would damage the epithelial cells of the stomach
if in contact with them.
44. Which parts of the alimentary canal prepare food for chemical digestion?
A. the mouth, oesophagus and stomach.
B. the mouth, stomach and small intestine.
C. the mouth, stomach and duodenum.
D. the teeth, stomach and pancreas.
Answer is C: The mouth (mastication and mixing with saliva); the stomach
(churning); the duodenum (segmentation). Choice C is better than choice B as
digestion has occurred before food reaches the distal parts of the SI.
45. What food is digested by lipase?
A. nucleic acids
B. carbohydrate

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