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自然界中存在着许多对人体有害的细菌。面对这些强大的敌人,人类在长期进化过程中也形成了强大的抵抗能力。这种抵抗能力是从下面这四道“防线”体现的。鼻子、气管空气中的致病菌会随着呼吸而进入鼻腔。鼻道能把病菌阻挡住,若是细菌侥幸钻过了鼻道,还有气管这一关。气管里的粘液和不断摆动的纤毛,会粘住细菌并将它们送出气管外,咳吐出去或被吞进胃中,让胃酸杀死。口腔口腔中的唾液除了含有淀粉酶、粘蛋白和无机盐帮助消化
There are many harmful bacteria in nature. In the face of these powerful enemies, humanity has also formed a powerful resistance in the long-term evolutionary process. This resistance is reflected in the following four “lines of defense.” Nose, tracheal airborne pathogens will enter the nasal cavity with breathing. The nasal passages can stop the bacteria, if the bacteria luckily drilled the nasal passages, there is trachea this off. The mucus in the trachea and the fluctuating cilia stick to the bacteria and send them out of the trachea, coughing out or swallowing into the stomach, killing the stomach acid. Saliva in the oral cavity helps digestion in addition to containing amylases, mucins and inorganic salts