Nonspecific defense mechanisms against infections
Before the immune system is activated by the invasion of foreign pathogens into the body, living beings are protected by external defenses or passive barriers.
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Biology 2nd Baccalaureate 13.2.1. Nonspecific mechanismsNonspecific defense mechanisms against infectionsBefore the immune system is activated by the invasion of foreign pathogens into the body, living beings are protected by external defenses or passive barriers. Fundamental insights on defense mechanisms against nonspecific infectionsWhen a foreign substance or agent tries to invade the body, it first has to overcome primary barriers, external defenses that prevent access:
These barriers are nonspecific, but if they are overcome, a second defensive barrier acts, nonspecific internal defenses:
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