How Much Do You Know About Gastric Acid Secretion? Quiz
The foods we eat have bacteria in it, and once it reached the stomach, it is introduced to acid that helps in killing them and easing digestion of foods. Gastric acid can at times be excreted in excess or low volumes due to a number of reasons. How much do you know about gastric acid secretion? Take up the quiz below and get to find out!
- 1.Experiments are conducted in human volunteers to measure the variations in gastric acid secretion thoughout the day. During which period would you expect the rate of acid secretion to be at its highest?
- A.
At lunch time while deciding which meal to eat
- B.
About one hour after eating the meal
- C.
Five minutes after eating the meal
- D.
Two to three hours after eating the meal
- 2.Which of the following sets of changes in acid secretion and serum gastrin levels are likely to occur in patients with pernicious anemia?
- A.
Increased acid secretion - decreased gastrin
- B.
Increased acid secretion - increased gastrin
- C.
Decreased acid secretion - increased gastrin
- D.
Decreased acid secretion - Unchanged gastrin
- 3.You are investigating the normal patterns of gastric acid secretion by measuring intragastric pH of volunteers throughout the day. When would you expect the pH of the stomach to be at its lowest?
- A.
After a meal high in fat
- B.
After a meal high in Protein
- C.
After a meal high in starch
- D.
In between meals
- 4.Surgical section of vagal afferent fibers from the stomach would results in which of the following effects?
- A.
An increased acid secretory response to cephalic stimuli e.g. site and taste of food
- B.
A decreased release of gastrin in response to digestion protein
- C.
A decreased acid secretory response to distension of the stomach
- D.
An increased release of somatostatin
- E.
An increased acid secretory response to histamine
- 5.Administration of an inhibitor of the gastric H+,K+-ATPase will have which of the following consequences?
- A.
No effect on the volume of gastric secretion
- B.
An Increased concentration of H+ in the gastric secretion
- C.
A decreased concentration of Na+ in the gastric secretion
- D.
An increase in the H+ concentration of the portal vein blood
- E.
A depolarization of the potential difference across the stomach
- 6.Which of the following would contribute to protection of the gastric mucosa, and therefore decrease the risk of peptic ulcer formation?
- A.
Proton pump inhibition
- B.
Prostaglandin synthesis inhibition
- C.
Metabolic products of Helicobacter Pylori, such as ammonia
- D.
Acetylcholine release
- E.
Histamine (H2 receptor) stimulation
- 7.According to the two-component model of gastric acid secretion, the H+ concentration of gastric juice increases with rate of secretion because of which of the following mechanisms?
- A.
The Volume of the parietal component increases
- B.
The concentration of H+ being secreted by the parietal cells increases
- C.
The volume of the non-parietal component decreases
- D.
The secretion of Na+ is inhibited
- E.
The secretion becomes hypertonic
- 8.In a laboratory experiment, the pH of the gastric antrum was reduced in the presence of amino - acids. The plasma gastrin level was determined and found to be lower than when the same amount of amino acids were given at a more alkaline pH. Increases in which of the following chemical signals mediates the reduced gastrin secretion at increased H+ concentration?
- A.
Gastrin Releasing Peptide
- B.
Histamine
- C.
Secretin
- D.
Somatostatin
- 9.The gastric intraluminal pressure was measured after introduction of differing volumes of a test meal. For any given volume of meal what would be the effect of vagotomy on the pressure recorded?
- A.
Decreased
- B.
Increased
- C.
Unchanged
- 10.A group of volunteers are asked to pick and chew their favorite sandwich filling and then spit it out without swallowing it. Simultaneous measurement of intragastric pH during this experiment shows a decrease. Which neurotransmitter causes this response?
- A.
Vasoactive intestinal polypeptide
- B.
Nitric oxide
- C.
Substance P
- D.
Gastrin Releasing Peptide
- E.
Norepinepherine
Questions: 10 | Attempts: 36830 | Last updated: Aug 31, 2020
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