Why doesnt meat tenderizer or pineapple juice break down the cells in your stomach?

Meat tenderizer and pineapple juice contain enzymes that break down proteins. However, the pH of the stomach is very low, which inactivates these enzymes. Additionally, the stomach contains a protease inhibitor that specifically inhibits the enzyme bromelain, which is found in pineapple juice. Therefore, meat tenderizer and pineapple juice do not break down the cells in your stomach.