What is the line of defense for pathogens in the nose mouth or eyes?

The primary line of defense against pathogens in the nose, mouth, and eyes includes physical barriers and mucosal defenses. The mucous membranes produce mucus that traps pathogens, while cilia help to sweep away debris and microorganisms. Additionally, tears and saliva contain antimicrobial enzymes, such as lysozyme, that help neutralize harmful agents. Collectively, these mechanisms work to prevent infections and maintain respiratory and ocular health.