Which of these does NOT provide a physical or chemical barrier?
A)Macrophages
B)Saliva
C)Urine
D)Mucus
E)Stratified squamous epithelium

Question

Quizplus · Accepted Answer

Macrophages are immune cells that phagocytize (engulf and destroy) pathogens, but they do not provide a physical or chemical barrier against them. The other choices all provide barriers: saliva contains antimicrobial enzymes, urine flushes out pathogens, mucus traps pathogens, and stratified squamous epithelium provides a physical barrier by covering and protecting underlying tissues.

Which of These Does NOT Provide a Physical or Chemical