Key differences, features, and comparative analysis of Barrier and Examples.
| Barrier | Examples |
|---|---|
| Physical | Skin; mucus coating of epithelium lining respiratory, GI, urogenital tracts |
| Physiological | Acid in stomach; saliva; tears — prevent microbial growth |
| Cellular | PMNL-neutrophils, monocytes, natural killer cells (lymphocytes), macrophages — phagocytose microbes |
| Cytokine | Interferons — secreted by virus-infected cells; protect non-infected cells from viral infection |
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