What features of the respiratory system protect us from infection?

Question

Quizplus · Accepted Answer

All of the choices listed contribute to protecting the respiratory system from infection. Nasal hairs and mucus both trap larger particles and prevent them from entering the respiratory system. Cilia move the trapped particles up and out of the respiratory tract. Macrophages are specialized immune cells that engulf and destroy invading pathogens. Together, these features help to maintain a healthy respiratory system by preventing infections from taking hold.

What Features of the Respiratory System Protect Us from Infection