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Which one of the following acts as a physiological barrier to the entry of microorganisms in human body?
A
Skin
B
Epithelium of urogenital tract
C
Tears
D
Monocytes
Detailed Solution
Innate immunity consists of four types of barriers: physical, physiological, cellular and cytokine barriers.
Physiological barriers: acid in the stomach, saliva in the mouth and tears from the eyes all prevent microbial growth.
Physical barriers: the skin and the mucus coating of the epithelium lining the respiratory, gastrointestinal and urogenital tracts.
Cellular barriers: leucocytes such as neutrophils (PMNL) and monocytes, natural killer cells and macrophages.
Hence tears act as a physiological barrier.
Physiological barriers: acid in the stomach, saliva in the mouth and tears from the eyes all prevent microbial growth.
Physical barriers: the skin and the mucus coating of the epithelium lining the respiratory, gastrointestinal and urogenital tracts.
Cellular barriers: leucocytes such as neutrophils (PMNL) and monocytes, natural killer cells and macrophages.
Hence tears act as a physiological barrier.