From the website: 'The immune system is a complex of organs - highly specialized cells and even a circulatory system separate from blood vessels - all of which work together to clear infection from the body.
The organs of the immune system, positioned throughout the body, are called lymphoid organs. The word 'lymph' in Greek means a pure, clear stream.
Lymphatic vessels form a circulatory system that operates in close partnership with blood circulation. Lymphatic vessels and lymph nodes are the parts of the special circulatory system that carries lymph, a transparent fluid containing white blood cells, chiefly lymphocytes.
Lymph bathes the tissues of the body, and the lymphatic vessels collect and move it eventually back into the blood circulation. Lymph nodes dot the network of lymphatic vessels and provide meeting grounds for the immune system cells that defend against invaders. The spleen, at the upper left of the abdomen, is also a staging ground and a place where immune system cells confront foreign microbes.
Pockets of lymphoid tissue are in many other locations throughout the body, such as bone marrow, thymus, tonsils, adenoids, Peyer's patches, and the appendix.
Both immune cells and foreign molecules enter the lymph nodes via blood vessels or lymphatic vessels. All immune cells exit the lymphatic system and eventually return to the bloodstream. Once in the bloodstream, lymphocytes are transported to tissues throughout the body, where they act as sentries on the lookout for foreign antigens.'
Page Title: 'Function of the Immune System: Strengthen Immunity
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Analyse any human emotion, no matter how far it may be removed from the sphere of sex, and you are sure to discover somewhere the primal impulse, to which life owes its perpetuation. ... The primitive stages can always be re-established; the primitive mind is, in the fullest meaning of the word, imperishable. ... Mans most disagreeable habits and idiosyncrasies, his deceit, his cowardice, his lack of reverence, are engendered by his incomplete adjustment to a complicated civilisation. It is the result of the conflict between our instincts and our culture. (Sigmund Freud)
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