| The lymphatic
system is the most important physiological system of combating foreign
bodies such as viruses, bacteria, or fungi. In humans it consists macroscopically
of: The bone marrow, spleen, thymus gland, lumph nodes, tonsils, appendix
and a few other organs.
The functioning of the lymphatic system is most easily seen at the microscopic level where the white blood cell is the single most importantant element. White blood cells are produced, as are red blood cells, in the marrow of bones The body is able to learn to combat viruses or bacteria that it has encountered before by chemical "remembering". This system allows people to be immune to diseases if they have encountered them previously. The most harmful bacteria and viruses in people are ones that are not easily identified as harmful by the immune system. |
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