How does our stomach know which food should be passed on to the intestine and which should still remain there for digestion?

Question

Assuming I eat some food which needs 4 hours of digestion in the stomach. 3 hours and 55 minutes later I eat something else which can get more easily digested but still needs, let‘s say 1 hour, of digestion. How does our stomach know what to pass on and what to keep?

In: 5

Answer 1

Thank you for all your explanations! I think I have a better overall understanding of that process. 😎