The mucous membranes of the respiratory tract repel pathogens because they
A) contain cilia, which propel pathogens out of the body.
B) produce mucus, which traps pathogens.
C) contain an acid mantle, which inhibits bacterial growth.
D) consists of tough protein, which repels most pathogens.

Question

Quizplus · Accepted Answer

The mucous membranes in the respiratory tract produce mucus, which is a sticky substance that can trap pathogens before they enter the body or before they are able to move deeper into the respiratory tract. Once trapped, the mucus is either coughed up or moved by the cilia towards the mouth where it can be expelled.

The Mucous Membranes of the Respiratory Tract Repel Pathogens Because