Components of the first line of defense include all the following, except
A)the tough cell sheet of the upper epidermis of the skin.
B)nasal hairs.
C)flushing action of tears and blinking.
D)flushing action of urine.
E)phagocytic white blood cells.

Question

Quizplus · Accepted Answer

All of the components listed in choices A through D are part of the first line of defense. The phagocytic white blood cells are part of the second line of defense, which involves immune cells that actively attack invading pathogens.

Components of the First Line of Defense Include All the Following