Question

What is the primary function of lysozyme in tears and saliva?

Options

• It breaks down bacterial cell walls

• It inhibits microbial growth through acidity

• It creates a mildly acidic, antimicrobial surface

• It increases blood vessel permeability

Answer 1

Lysozyme is a chemical barrier present in tears and saliva that functions by breaking down bacterial cell walls, thereby destroying pathogens at body surfaces. It is part of the second line of defence and provides continuous antimicrobial protection.