21. The Immune System

Which physical, nonspecific host defense mechanism is associated with the respiratory tract and trachea?

Besides acting as mechanical barriers, the skin epidermis and mucosae of the body have other attributes that contribute to their protective roles. Cite the common body locations and the importance of mucus, lysozyme, keratin, acid pH, and cilia.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

Surface barriers contain substances in their secretions that kill pathogens and deter their growth.

The chemotherapeutic drugs Mr. White is taking affect all cells that undergo rapid mitosis, such as those of the skin. What effect would this have on the functions of the skin? How could this affect his immunity?

Which of the following make up the body's first line of defense?

a. Surface barriers

b. Cells and proteins of adaptive immunity

c. Cells and proteins of innate immunity

d. All of the above