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2. Respiratory tract antimicrobial defense system - Wikipedia

   en.wikipedia.org/wiki/Respiratory_tract...

   In the first line of defense, inhaled bacteria are trapped by mucus and are swept toward the pharynx and are swallowed. [1] Bacteria which penetrate the mucous layer are dealt with a second line of defense which includes antimicrobial peptides that are secreted by the surface epithelium of the respiratory tract which kill many strains of ...

3. Acid–base homeostasis - Wikipedia

   en.wikipedia.org/wiki/Acid–base_homeostasis

   The second and third lines of defense operate by making changes to the buffers, each of which consists of two components: a weak acid and its conjugate base. [ 5 ] [ 13 ] It is the ratio concentration of the weak acid to its conjugate base that determines the pH of the solution. [ 14 ]

4. Tonsil - Wikipedia

   en.wikipedia.org/wiki/Tonsil

   The tonsils are a set of lymphoid organs facing into the aerodigestive tract, which is known as Waldeyer's tonsillar ring and consists of the adenoid tonsil (or pharyngeal tonsil), two tubal tonsils, two palatine tonsils, and the lingual tonsils.

5. Immune system - Wikipedia

   en.wikipedia.org/wiki/Immune_system

   A scanning electron microscope image of a single neutrophil (yellow/right), engulfing anthrax bacteria (orange/left) – scale bar is 5 μm (false color). The immune system is a network of biological systems that protects an organism from diseases.

6. AOL Mail

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7. Immune response - Wikipedia

   en.wikipedia.org/wiki/Immune_response

   An immune response is a physiological reaction which occurs within an organism in the context of inflammation for the purpose of defending against exogenous factors. These include a wide variety of different toxins, viruses, intra- and extracellular bacteria, protozoa, helminths, and fungi which could cause serious problems to the health of the host organism if not cleared from the body.

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9. Work begins sealing breach at China's second-largest ... - AOL

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   More than 2,300 rescue personnel were working to build a second line of defence, with footage showing excavators piling boulders into barriers and being resupplied by trucks.