Question 18M.3.HL.TZ2.20
| Date | May 2018 | Marks available | [Maximum mark: 5] | Reference code | 18M.3.HL.TZ2.20 |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | Explain, Outline, State | Question number | 20 | Adapted from | N/A |
State the disease caused by Helicobacter pylori.
[1]
stomach ulcer
OR
stomach cancer
Outline how gastric acid is produced in the stomach.
[2]
a. sight/smell/«presence of» food in stomach stimulates nervous system
b. nervous system/vagus nerve stimulates gastric glands «to produce gastric acid»
c. gastrin controls release of gastric acid
d. parietal cells «are stimulated to» release gastric/hydrochloric acid/HCl
e. acidity maintained by the proton pump/H+/K+ ATPase
Explain why proton pump inhibitors alleviate the symptoms of H. pylori infections.
[2]
a. as proton pumps are inhibited less protons/H+ into stomach «lumen»
b. «less protons/H+ in stomach» less hydrochloric acid produced
OR
stomach «contents» become less acidic
OWTTE.
c. stomach heals with higher pH