DP Biology (last assessment 2024)
Question 18M.3.HL.TZ2.20b
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.HL.TZ2.20b |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | Outline | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
18M.3.HL.TZ2.20b
(b)
Outline how gastric acid is produced in the stomach.
[2]
Markscheme
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
