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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. 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.

  4. Waldeyer's tonsillar ring - Wikipedia

    en.wikipedia.org/wiki/Waldeyer's_tonsillar_ring

    Waldeyer's tonsillar ring (pharyngeal lymphoid ring, Waldeyer's lymphatic ring, or tonsillar ring) is a ringed arrangement of lymphoid organs in the pharynx.Waldeyer's ring surrounds the naso-and oropharynx, with some of its tonsillar tissue located above and some below the soft palate (and to the back of the mouth cavity).

  5. Outline of human anatomy - Wikipedia

    en.wikipedia.org/wiki/Outline_of_human_anatomy

    Human anatomy is the scientific study of the morphology of the adult human. It is subdivided into gross anatomy and microscopic anatomy . Gross anatomy (also called topographical anatomy, regional anatomy, or anthropotomy) is the study of anatomical structures that can be seen by unaided vision.

  6. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. 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.

  8. 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 ]

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

    www.aol.com/news/begins-sealing-breach-chinas...

    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.