How Is Food Broken Down Further?

When the stomach is empty it has folds and wrinkles, and when it is full, the folds expand and it smooths out. When the stomach is full, it can hold more than a liter!

The stomach has walls that has glands that produce chemicals, such as acids which break down food. It contains mucus to keep food moist and slippery.

There are 3 layers of muscles in the stomach to squeeze food with wave-like motions. They contract and relax to create those motions. It squeezes and mixes the bolus 'until it is almost like liquid. Then it is released into the small intestine. (after 4-6 hours)

Stomach