Four kinds of barriers preventing foreign agents' entry into the body include physical (skin, mucus), physiological (gastric acid, saliva, tears), cellular (WBCs, macrophages), and cytokine (interferons).
Cuatro tipos de barreras que impiden la entrada de agentes extraños al cuerpo son físicas (piel, mucosidad), fisiológicas (ácido gástrico, saliva, lágrimas), celulares (glóbulos blancos, macrófagos) y citocinas (interferones).
| Front | four kinds of barriers which prevent entry of foreign agents into the body |
|---|---|
| Back | physical (skin, mucus) physiological (gastric acid, saliva, tears) cellular (WBC - polymorpho nuclear leukocytes, monocytes, natural killer cells; macrophages) cytokine (interferons) |
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