Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function The Lymphatic and Immune Systems Lymphatic Organs and Structure The Immune System The Lymphatic and Immune Systems 6.8

Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function Thymus Spleen Lymph nodes Lymphatic vessel The Lymphatic Organs and Structures The lymphatic and immune systems share certain organs, vessels, and nodes. The Lymphatic and Immune Systems 6.8

Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function The Lymphatic and Immune Systems Lymphatic Organs and Structures (cont.) The Lymphatic System Contains the lymph nodes, lymph vessels, spleen, and thymus gland. Produces disease-fighting immune cells. Contains the lymph (watery fluid that has entered lymph capillaries and is found in lymph vessels). Formed when liquid plasma and protein from the blood ooze out of their capillaries and are then picked up by the almost transparent lymph capillaries (vessels). 6.8

Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function Lymph vs. Blood Lymphatic vessels transport lymph (fluid) to and from the bloodstream. Lymph and blood transport various substances around the body. Lymph DOES NOT contain RBC’s or platelets. Lymph DOES contain WBC’s. Lymph carries less protein than blood. Both carry about the same amount of H2O, salts, sugar, and waste material.

Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function The Lymphatic and Immune Systems Lymph Circulation Just as blood circulates throughout the body so does the lymph. Lymphatic vessels are found in every organ and tissue of the body. These lymphatic vessels flow alongside one’s blood vessels. However, unlike blood, lymph does not flow because of a heart “pump”. Lymph flows slowly, coaxed by the movement of the body’s muscles, until it empties back into the blood vessels just above the heart. 6.8

Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function Lymph Node Lymph nodes contain special cells (macrophages) that devour foreign substances.

Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function The Lymphatic and Immune Systems Lymph Nodes Located everywhere in the body except the CNS. Tonsils Adenoids Neck Armpit Chest Groin 6.8

Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function The Lymphatic and Immune Systems Two Organs of the Lymph System Spleen Thymus Gland 6.8

Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function The Spleen Located in the LUQ.

Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function The Functions of the Spleen Filters foreign material from the blood Stores blood Destroys old RBC’s Activates lymphocytes

Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function Thymus Gland

Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function The Lymphatic and Immune Systems The Immune System Contains the lymph nodes, lymph vessels, spleen, and thymus gland. Produces disease-fighting immune cells. Includes all types of immunity, either natural or acquired by the body. 6.8

Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function Types of Immunity Natural immunity - is the human body's natural resistance to certain diseases. Acquired active immunity - is acquired either by having a disease and producing natural antibodies to it or by being vaccinated against the disease. Acquired passive immunity - is immunity provided in the form of antibodies or antitoxins that have been developed in another person or another species.

Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function The Lymphatic and Immune Systems What are antibodies? 6.8

Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function The Lymphatic and Immune Systems Specialized proteins that fight disease. What are antibodies? 6.8