What is the main function of the spleen?
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M$4 Answers
- white pulp: Active immune response through humoral and cell-mediated pathways.
- Production of opsonins, properdin, and tuftsin.
- Creation of red blood cells. While the bone marrow is the primary site of hematopoiesis in the adult, the spleen has important hematopoietic functions up until the fifth month of gestation. After birth, erythropoietic functions cease, except in some hematologic disorders. As a major lymphoid organ and a central player in the reticuloendothelial system, the spleen retains the ability to produce lymphocytes and, as such, remains an hematopoietic organ.
- Storage of red blood cells and other formed elements. In horses roughly 30% of the red blood cells are stored there. The red blood cells can be released when needed. In humans, up to a cup (236.5ml) of red blood cells can be held in the spleen and released in cases of hypovolemia.14 It can also store platelets in case of an emergency.
http://en.wikipedia.org/wiki/Spleen
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M$Because of these passageways it contains a great amount of blood which can be "put back into circulation" if the blood pressure drops and it is needed back in the body.
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