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the Third barrier of protection against antigenes

As a child, the person transmission of infectious diseases, which later as an adult, he was never ill.
That is why they are called "children's infectious diseases"

is development by an organism of antibodies. Development of antibodies is a reaction. gumoralnogo and cellular иммунитетa, Which it is carried out by the main cages immune system-limfotsitami.
It is the most important and effective protection of an organism. The immune system of the person is presented by the central and peripheral bodies which are capable to make and nakaplikvat limfotsity.
the central bodies concern a red marrow, vilochkovaja gland (timus) and congestions limfoidnoj fabrics in intestines, and to peripheral - limfouzly, lymphatic vessels, a spleen and blood.

Limfotsity are formed in a red marrow. At a certain stage of maturing they leave In blood also pass following stages of maturing in other central bodies of immune system. For example. T-limfotsity Finish the development in timuse.
Timus-it "pebble-leather" chelovecheskoju an organism. The spleen possesses in the big sizes at the child and reaches to May of the maximum weight to the period of the sexual Maturing. After achievement by the person of a sexual maturity it Undergoes return development.

As a result of contact to an antigene limfotsit develops zashchitknye factors, antibodies, for neutralisation and deducing from orgaknizma alien agents. Activity of antibodies is selective and directed on recognition and linkage of certain anti-genes.
besides, antibodies possess ability to activate other protective systems of an organism which as a result copes with alien agents.

- the First barrier

- the Second barrier