Physical barrier = .............. and physiological barrier = .............
Physical barrier = .............. and physiological barrier = .............
- A
Skin, saliva in the mouth
- B
Macrophage, acid in the stomach
- C
Respiratory tract, $PMNL$
- D
Urinogenital tract, $PMNL$
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- [NEET 2019]
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Label $A, B$ and $C$
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