Summary Biology 238 Human Anatomy and Physiology Power point study guide

UNM – Los Alamos Biology 238 Human Anatomy and Physiology Powerpoint Chapter 20 The Lymphatic System and Lymphoid Organs and Tissues Chapter Topics • Lymphatic vessels • Lymphoid cells • Lymph nodes • Lymphoid organs Lymphatic System • Consists of three parts that work together • A network of lymphatic vessels (lymphatics) • Lymph – fluid and proteinsleaked from the bloodstream • Lymph nodes and other lymphoid organs that assist and extend the functions of the lymph nodes • Performs two primary functions: • Returns fluid lost from bloodstream to the bloodstream – up to 3 L of fluid is lost from capillaries each day • Provides a surveillance site for immune cells – provides the structural basis of the immune system Venous system Heart Arterial system Lymphaticsystem: Lymph duct Lymph trunk Lymph node Lymphatic collecting vessels, with valves Blood Lymphatic Tissue fluid Tissue cell capillaries capillary Blood capillaries