Nothing really but a little pinch. Your stomach a flexible sac-like organ. You can sort of mold it to be anything. Now that is just technically speaking. It's very flexible. You have your layer of fat that is also protecting it. Nothing bad/good is going to happen. If you are pregnant. You might have a small prob. ;) Won't increase/decrease anything.
i usually cut myself and i don't know y i do it usually if in depressed sad or upset but one time when i cut my stomach i had a panic attack and fainted so its not the best idea to do it.
abosrption
No
Something happens.
it is because of the peristalsis
Esophagus
It will push out, if you are breathing from the diaphragm.
It si dissovled by stomach acid.
If you push it hard maybe it was just pressure that caused pain but if you pushed your stomach gently maybe your stomach is cramping just tell a trusted person and see what they say
You need to hold your stomach in when doing crunches. If you push your stomach out the muscle will shape that way.
the gastric juices in your stomach eat the stomach wall and you will die
Everyone can 'push' their stomach out far more than would be suggested just by looking at them. (It's useful to have an ability to do this for pregnancy and over-eating).
The trachea is your windpipe, so food shouldn't go down there. However peristalsis does help push food down the Oesophagus into the stomach.