BSCI 201 Lecture Notes - Hematopoietic Stem Cell, T Cell, Tonsillitis
18 Feb 2014
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Document Summary
Plays essential roles in body defense and resistance to disease. Developmental aspects of the lymphatic system and the body defenses. Except for the thymus and spleen, the lymphoid organs are poorly developed before birth. A newborn has no functioning lymphocytes at birth, only passive immunity from the mother. If lymphatics are removed or lost, severe edema results, but the vessels may grow back in time. Hematopoietic stem cells: precursor for all blood cells. T lymphocytes migrate from bone marrow to thymus. Thymus turns to fat as we get older because most diseases are seen when we are younger. Vaccines is modern technology to reveal us to diseases so we know how to fight them. Spleen. lymph nodes, tonsils, adenoid, appendix, peyer"s patches. Collection of b cells, t cells, and macrophages. Work to expose them to leukocytes in high concentrations. Spleen and lymph nodes filter blood and lymph. Located on the left side of the abdomen.
