Lymphatic System Notes.docx

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Biological Sciences Program
BSCI 201
Justicia Opoku

Lymphatic System The Lymphatic System Consists of two parts Lymphatic Vessels Lymphoid tissues and organs Lymphatic system functions Transports escaped fluid back to the blood Plays essential roles in body defense and resistance to disease Also has a role in digestion DevelopmentalAspects of the lymphatic system and the Body Defenses Except for the thymus and spleen, the lymphoid organs are poorly developed before birth. Anewborn 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. Central Lymphoid tissue Bone Marrow Hematopoietic stem cells: precursor for all blood cells Leukocytes except T lymphocytes fully develop here. Thymus T lymphocytes migrate from bone marrow to thymus Develop maturity in 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. Peripheral Lymphoid tissue Spleen. lymph nodes, tonsils, adenoid, appendix, Peyer’s patches Collection of B cells, T cells, and macrophages. Functions to trap microorganisms and foreign particles Work to expose them to leukocytes in high concentrations Spleen and Lymph nodes filter blood and lymph. Lymphoid Organs that contribute to Lymphatic Function Spleen Located on the left side of the abdomen Filters blood and destroys worn out blood cells Forms blood cells in the fetus Acts as a blood reservoir Thymus located low in the throat, overlying the heart Functions at peak levels only during childhood Produces hormones (like thymosin) to program lymphocytes Tonsils Masses of lymphoid tissue around the pharynx Trap and remove bacteria and other foreign material Tonsillitis is caused by congestion with bacteria Peyer’s patches Found in the wall of the small intestine and
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