Mammals Use Several Strategies to Prevent Inhaled Pathogens from Entering

question 53

Multiple Choice

Mammals use several strategies to prevent inhaled pathogens from entering the body through the lungs;in this instance the

• A) lung secretions create an acidic and inhospitable environment for pathogens.
• B) mucus secreted into the bronchioles traps pathogens and is eventually removed by the action of the cilia lining the airway.
• C) multiple layers of dead epithelial cells within the lungs that create a virtually impenetrable barrier to pathogen movement.
• D) macrophages in the lungs produce the immobilizing toxins that paralyze pathogens before they can infect the body.