Q. With regard to gastric acid secretion, all the following are true EXCEPT: (Solved)
1. acetylcholine stimulates secretion
2. both G protein and direct calcium channels are involved
3. an H+ - K+ antiport transports H+ into the gastric lumen
4. parietal cells have high levels of carbonic anhydrase
5. acid secretion is maintained at constant levels by local feedback mechanisms
- e. acid secretion is maintained at constant levels by local feedback mechanisms