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1 The Lymphatic System network of tissues, organs and vessels that help to maintain the body s fluid balance & protect it from pathogens lymphatic vessels, lymph nodes, spleen, thymus, tonsils, etc without it neither the circulatory system nor the immune system would function can be thought of as an accessory to the circulatory system it helps the circulatory system to do its job the two systems are directly connected together it consists of fluid derived from plasma =lymph and white blood cells (esp lymphocytes and macrophages (monocytes)) the lymph travels in only one direction it doesn t circulate Lymph Lymph is a clear watery fluid that resembles blood plasma but: has fewer proteins its composition varies depending on organs that it drains the lymphatic system handles 125 ml/hr ( ml of lymph/day) ~1/2 of this from the liver and small intestine alone Lymphatic Vessels (=lymphatics): Lymphatic Capillaries originate in tissues as tiny blind ended sacs lie side by side with blood capillaries single layer of endothelial cells like blood capillaries but much more permeable to solvents, and large solutes and whole cells Lymphatic Vessels these small lymphatic capillaries merge with others to form larger lymphatic vessels lymphatic vessels resemble veins in structure: Human Anatomy and Physiology : The Lymphatic System Ziser Lecture Notes,ΔΆ a.