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  2. Acid–base homeostasis - Wikipedia

    en.wikipedia.org/wiki/Acid–base_homeostasis

    Metabolic component: The third line of defense is slow, best measured by the base excess, [9] and mostly depends on the renal system which can add or remove bicarbonate ions (HCO − 3) to or from the ECF. [5] Bicarbonate ions are derived from metabolic carbon dioxide which is enzymatically converted to carbonic acid in the renal tubular cells.

  3. American football positions - Wikipedia

    en.wikipedia.org/wiki/American_football_positions

    A diagram showing an I formation on offense and a 4-3 formation on defense In American football , the specific role that a player takes on the field is referred to as their "position". Under the modern rules of American football, both teams are allowed 11 players [ 1 ] on the field at one time and have "unlimited free substitutions", meaning ...

  4. File:Defense In Depth - Onion Model.svg - Wikipedia

    en.wikipedia.org/wiki/File:Defense_In_Depth...

    You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

  5. Association football tactics and skills - Wikipedia

    en.wikipedia.org/wiki/Association_football...

    In zone defence, second and third defenders and midfielders are organised in two lines, in the transversal direction of the field, constituting a defender line and a midfielder line, the midfield line working as a "second shield" of the defence. The lines should be fairly possible, though the first defender and in some cases the second defender ...

  6. Association football positions - Wikipedia

    en.wikipedia.org/wiki/Association_football_positions

    Originally, a full-back was the last line of defence, but as the game developed in the early 20th century, the centre-half role was dropped backwards and came to be known as 'centre-back', and the full-backs were then pushed out wider to create the right-back and left-back positions.

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  8. Eight-man football defensive formations - Wikipedia

    en.wikipedia.org/wiki/Eight-man_football...

    The line consists of two tackles and two ends. Tackles line up anywhere between heads up on the offensive guards to the shoulders of the center. Responsible for run stop through the middle of the line. Ends line up in an up position on the outside shoulder of the widest offensive lineman. Acts as the "contain" man.

  9. 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 ...