Lymphatic System-tutorial 3
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Describe the three functions of the lymphatic system
• Drain excess interstitial fluid from tissue spaces and return it to the blood • Transport lipids and lipid soluble vitamins from the villi in the small intestine to the blood • As part of the immune system destroys microbes and cancerous or foreign particles
Name the cells of lymph nodes and describe their role / function in the nodes
• B cells (lymphocyte): Mature in the bone marrow (hence called B cells), the function of lymphocytes in the nodes is to stimulate immune responses • T cells (lymphocyte): Mature in the thymus (hence called T cells), the function of lymphocytes in the nodes is to stimulate immune responses • Macrophages (phagocyte): The function of the macrophages in the nodes is to destroy foreign substances through phagocytosis
Name three areas of lymphatic nodules
• Peyer’s patches in the ileum of the small intestine • Appendix contains lymph tissue destroys bacteria • Tonsils form ring at top of throat
Describe the anatomical position of the spleen
Located in left hypochondriac region, between stomach and diaphragm
State three functions of the spleen
• Remove damaged blood cells and platelets • Store platelets (1/3 of the body’s supply) • Stores red blood cells (250ml in adult) • Production of blood cells during foetal life • Performs immune functions as per lymph nodes
Describe the differences between cancerous nodes and infected nodes
Cancerous lymph nodes - firm, enlarged, non-tender and fixed to underlying structures Infected lymph nodes - softer, enlarged, very tender and movable