Which of the following is not a first line of defense?
A) IgA antibodies in sweat.
B) The acid mantle of the skin.
C) gut associated lymphoid tissue
D) dust cells of the lungs
Answer: D) dust cells in the lungs
A) IgA antibodies in sweat.
B) The acid mantle of the skin.
C) gut associated lymphoid tissue
D) dust cells of the lungs
Answer: D) dust cells in the lungs