To tenderize tough pieces of meat

Meat tenderizer is often used to tenderize tough pieces of meat, like steak. Knowing that steak is made of protein-rich muscle tissue from cows, can you think of an explanation for how meat tenderizer works?This is certainly true when it comes to notoriously tough cuts of meat like beef brisket and pork shoulder. Cooking these cuts of meat slowly, either by braising, stewing or grill roasting, is the best way to get these tasty cuts of meat meltingly tender.