The first line of host defense is the barrier presented to the external environment. Which of the following statement(s) is/are true concerning host barriers?
A. Sebaceous glands secrete chemical compounds that maintain a relatively high pH, providing effective bacterial stasis
B. Within the respiratory tract, ciliary function serves to extrude microorganisms trapped within the mucus secretion layer
C. The low pH within the stomach markedly decreases bacterial content of the upper gastrointestinal tract
D. Gut peristalsis serves to prevent microbial adherence and invasion
Answer:B
The first line of host defense is the barrier presented to the external environment. Which of the following statement(s) is/are true concerning host barriers?
A. Sebaceous glands secrete chemical compounds that maintain a relatively high pH, providing effective bacterial stasis B. Within the respiratory tract, ciliary function serves to extrude microorganisms trapped within the mucus secretion layer C. The low pH within the stomach markedly decreases bacterial content of the upper gastrointestinal tract D. Gut peristalsis serves to prevent microbial adherence and invasion