All of the following protect the skin and mucous membranes from infection EXCEPT

A) multiple layers of cells.
B) tears.
C) saliva.
D) HCl.
E) the "ciliary escalator."


D

Biology & Microbiology

You might also like to view...

Epstein-Barr virus may become latent in

A. red blood cells. B. T cells. C. nerve cells. D. B cells.

Biology & Microbiology

Animals that obtain their body heat from internal metabolism are called:

a. ectotherms. b. poikilotherms. c. endotherms. d. osmoconformers. e. osmoregulators.

Biology & Microbiology

A person you know has been in an automobile accident. After the accident, you notice a dramatic personality change

Before the accident, he was industrious and well liked; after the accident, he is profane, impetuous, and incapable of working toward a goal. Which portion of the brain was most likely damaged? A) occipital lobe B) temporal lobe C) frontal lobe D) parietal lobe

Biology & Microbiology

Adult stem cells are always unipotent.

Answer the following statement true (T) or false (F)

Biology & Microbiology