Which correctly describes a major function of the stomach? lubricating food so it can be formed into a bolus the complete digestion of protein to amino acids maintaining an alkaline ph for the digestion of proteins storing ingested food and partially digesting macromolecules absorption of saliva and chyme into the bloodstream?

The correct option is this: STORING INGESTED FOOD AND PARTIALLY DIGESTING MACRO MOLECULES.
During the digestive process, the stomach secretes acid and enzymes which digest the food in the stomach. The stomach muscles contract periodically in order to churn up the food and ensure digestion, thus turning the food to chyme. When the stomach has done its part in digestion, the chyme will be passed to the small intestines through the pyloric sphincter.