Question

What's stomach and what job does it do

Answer 1

Well the Stomach is a Muscular hollow organ. It takes in food from the esophagus, mixes it, breakes it down then passes it on the the small intestine in small portions ... im eating a doughnut while im answering this questions xD 

Answer 2

The stomach is a muscular hollow organ. It takes in food from the esophagus (gullet or food pipe), mixes it, breaks it down, and then passes it on to the small intestine in small portions. The entire digestive system is made up of one muscular tube extending from the mouth to the anus.
Hope this is of help to you, and happy studying~!
~Isle of flightless Duns