Question

what prevents pathogens from entering our bodies through the delicate tissues of the lungs?

certain cells in the lungs produce toxins that paralyze pathogens before they can infect the body.

the lining of the lungs has a low ph that creates an inhospitable environment for most pathogens.

the cells of the lungs are covered by several layers of dead cells that prevent pathogens from reaching living lung tissue.

the tubes that enter the lungs are lined with mucus that traps pathogens and is then removed from the respiratory system.

Explanation:

To determine the correct answer, we analyze each option:

• Option 1: Lung cells don't typically produce toxins to paralyze pathogens.
• Option 2: The lung lining doesn't have a low pH (stomach does for that).
• Option 3: Lung tissue is not covered by dead cell layers (skin has that, lungs have a different protective mechanism).
• Option 4: The respiratory tract (tubes entering lungs) is lined with mucus that traps pathogens, and cilia move this mucus (with pathogens) out, which is a key defense mechanism.

Answer:

D. The tubes that enter the lungs are lined with mucus that traps pathogens and is then removed from the respiratory system.