Nokea
All of the following are components of saliva EXCEPT?
- A. Mucin
- B. Pepsin
- C. Amylase
- D. IgA antibodies
Correct Answer: B
Rationale: Pepsin is not a component of saliva; it is found in the stomach where it helps digest proteins. Saliva contains mucin, amylase, and IgA antibodies.
You may also like to solve these questions
Digestion of starch starts from the mouth, whereas ...A... is the site of digestion mainly for ...B... Choose the correct combination of options to complete the given statement.
- A. A-Stomach; B-Protein
- B. A-Stomach; B-Starch
- C. A-Small intestine; B-Protein
- D. A-Small intestine; B-Cellulose
Correct Answer: C
Rationale: The small intestine is the primary site for protein digestion, while starch digestion begins in the mouth.
All about hepatocyte is true EXCEPT:
- A. Has 3 types of borders
- B. May be binucleated
- C. Secrete bile
- D. Has long microvilli forming brush border
Correct Answer: D
Rationale: Hepatocytes have microvilli facing the space of Disse, but not a brush border, which is characteristic of intestinal enterocytes.
Which part(s) of the esophagus necessitate(s) input from the central nervous system to orchestrate peristalsis?
- A. The upper third
- B. The middle third
- C. The lower third
- D. The upper and middle portions
Correct Answer: A
Rationale: The upper third of the esophagus, with striated muscle, requires CNS input (via the vagus nerve) for primary peristalsis.
Infants' gastric juice contains
- A. Nuclease, pepsinogen, lipase
- B. Maltase, pepsinogen, rennin
- C. Amylase, rennin, pepsinogen
- D. Pepsinogen, lipase, rennin
Correct Answer: D
Rationale: Infants' gastric juice contains pepsinogen, lipase, and rennin to aid in milk digestion.
Secretin is a hormone that:
- A. stimulates the release of pancreatic fluid
- B. converts trypsinogen into trypsin
- C. activates chymotrypsin
- D. inhibits the action of pancreatic lipase
Correct Answer: A
Rationale: Secretin stimulates the pancreas to release bicarbonate-rich fluids to neutralize stomach acid.