Question

20 multiple choice 10 points mucus, tears, saliva, and hair are all examples of what type of defense against potential pathogens? mononuclear phagocytic system adaptive defenses chemical barriers mechanical barriers

Explanation:

Mucus traps pathogens, tears and saliva wash them away, and hair blocks their entry. These are physical means of defense, which are mechanical barriers. The mononuclear phagocytic system involves cells that engulf pathogens. Adaptive defenses are specific immune responses. Chemical barriers involve substances like enzymes and antibodies.

Answer:

D. Mechanical barriers