The first enzyme to mix with food in the digestive tract is amylase (C). Amylase is present in saliva and begins to break down starch into simpler sugars in the mouth.
Explanation:
Amylase:
This enzyme, produced by the salivary glands, is the first to come into contact with food in the digestive tract. It initiates the breakdown of carbohydrates, specifically starches, into simpler sugars.
Pepsin:
This enzyme is produced in the stomach and digests proteins.
Cellulase:
This enzyme is not found in the human digestive system and is not used to digest the food. It is an enzyme that can break down cellulose.
Trypsin:
This enzyme is produced in the pancreas and is involved in the digestion of proteins in the small intestine.