The eyes and the respiratory tract are both protected against infections by
A) the mucous membranes that cover their surface.
B) the secretion of complement proteins.
C) the release of slightly alkaline secretions.
D) the secretion of lysozyme onto their surfaces.
E) interferons produced by immune cells.

Question

Quizplus · Accepted Answer

The secretion of lysozyme onto the surfaces of the eyes and respiratory tract helps protect against infections. Lysozyme is an enzyme that can break down bacterial cell walls, making it an effective antimicrobial agent.

Answer: A
 The mucous membranes that cover the surface of the eyes and respiratory tract also provide a physical barrier that helps protect against infections. The mucous membranes produce mucus, which can trap and remove bacteria and viruses from the surface of these tissues.

The Eyes and the Respiratory Tract Are Both Protected Against