Answer:
The esophagus the stomach the small intestine the large intestine and the rectum
Explanation:
Enzymes function best at the normal pH level they were made to be in. Most work best at a neutral pH level (7), but some enzymes such as pepsin (located in the stomach) work best in very acidic pH levels. If the pH level becomes too acidic for the enzyme, it can lead to denaturing of the enzyme's active site.
It allows more oxygenated blood to be delivered to the muscles.
