A person starts to eat a hamburger. As she takes a bite and chews, an enzyme called salivary lipase helps to begin the process of fat digestion. Which of these is the BEST description of the role of enzymes in digestion?
A. Enzymes are acids that physically break down food molecules.
B. Enzymes moisten food to help teeth in the mechanical process of grinding and chewing.
C. Enzymes are proteins that speed up the process of chemically breaking down food molecules.
D. Enzymes are cells that secrete saliva and other necessary substances needed for digestion.