What causes the pyloric sphincter to open?
A) The increase in gastrin.
B) The mixing of chime.
C) The low pH of the stomach.
D) None of these are correct.

Question

Quizplus · Accepted Answer

As the mixing of the chyme continues, the pH falls due to hydrochloric acid's low pH. As the pH of the stomach's contents approaches 2, the endocrine cells of the gastric pits are prevented from producing any more gastrin. This low pH also causes the pyloric sphincter to begin to open, allowing approximately 3 mL of chyme to leave the stomach at a time.

What Causes the Pyloric Sphincter to Open