Final answer:
Lysozymes act as an innate immune defense in the gastrointestinal tract by destroying bacteria cell walls.They are found in various secretions, such as saliva and tears, and play a crucial role in preventing infections.
Step-by-step explanation:
The factor that acts as an innate immune defense in the gastrointestinal tract is lysozymes.
Lysozymes are enzymes that destroy bacteria by digesting their cell walls.
They are found in various secretions, such as saliva and tears, and play a crucial role in preventing infections.