initiates protein digestion and denatures proteins
Oral cavity and stomach
They are the teeth. Stomach also involve in mechanical digestion
The mouth (by chewing) and the stomach (by gastric motion).
The mouth and the stomach are two anatomical regions involved in the mechanical breakdown of food. In the mouth, teeth mechanically break down food into smaller pieces through mastication. In the stomach, muscular contractions churn and mix food with digestive juices to further break it down into a semi-liquid state.
oral cavity and stomach
Peristalsis. The movement of muscles bringing the food to the stomach.
The stomach squeezes to help break down food.
Chruning
The third layer of smooth muscle found in the stomach wall is called the oblique layer. It runs diagonally and allows for churning and mixing of food, aiding in mechanical breakdown and digestion.
The stomach has a very acidic environment. This favors the breakdown of proteins. An enzyme (i.e. a biological catalyst) called trypsin is active at acidic conditions (gastric juice) and is responsible for the break down of proteins in the stomach.
It uses both mechanical and chemical breakdown. The muscles of the stomach and the stoma (well a special opening that allows food to enter and to leave) push food into the intestines. Acid within the stomach and other no so famous chemicals break down the food to be small enough to be processed in the intestines and colons. Another device helps the stomach and uses chemical breakdown too: The gall bladder emits bile and the liver filters broken down matter and dangerous matter (such as alcohol, diseases, foreign matter (smoke, marijuana, poison, etc).
The main digestive function occurring in the stomach happens when the muscles churn the food into a consistency that is easier to digest for the rest of your intestines. The stomach releases acids and enzymes for the chemical breakdown of food. Pepsin is responsible for protein breakdown.