Final answer:
The enzyme called lysozyme found in tears, saliva, and perspiration acts as a chemical barrier to help kill or inhibit bacteria, whereas enzymes like amylase and lipase in saliva break down carbohydrates and fats.
Step-by-step explanation:
Tears, saliva, and perspiration contain an enzyme called lysozyme that helps kill or inhibit bacteria. This enzyme is important and forms part of our body's chemical barriers that protect against infection. Although saliva does contain digestive enzymes like amylase and lipase, which are responsible for breaking down carbohydrates and fats respectively, it is lysozyme that has the antibacterial properties. Amylase, for example, begins the chemical digestion in the mouth by breaking down carbohydrates, not proteins.