The body’s ability to prevent damage and fight disease relies on its immune system, which includes all the cells and tissues that carry out immune responses. Acquired immunity, and part of innate immunity, is carried out by the lymphatic system, consisting of a variety of organs and lymphatic tissues throughout the body, as well as a specialized system of lymphatic vasculature connecting them. It has 3 main functions: to carry immune responses, to drain the excess blood plasma that has leaked out as interstitial fluid, and to transport lipids and lipid-soluble vitamins from the gastrointestinal tract to the bloodstream. This learning program begins with an overview of the immune system. You will learn about different barriers to infection and about the components and organization of the lymphatic system. You will then learn about specific lymphatic organs and tissues and how they relate to the immune response. You will also learn about the various immune cells created by the lymphatic system to help the body in its fight against diseases and pathogens.
Upon completion of this learning program, you will be able to::
Outline the body’s defenses and barriers.
Explain the organization of the lymphatic system.
Identify lymphatic organs and tissues.
Explain the role of lymphatic organs.
Identify the different types of immune cells.
Explain the role of immune cells.
Immunity and The Lymphatic System
Barriers to Infection
Lymphatic Tissue and Lymphocytes
Side Note: Did You Know? – Historical Perspective
Side Note: Digging Deeper – Non-Immune Functions of the Lymphatic System
LYMPHATIC ORGANS AND TISSUES
Primary Lymphatic Organs
Secondary Lymphatic Organs
Secondary Lymphatic Tissues
THE IMMUNE CELL LINEAGE
Lymphoid Cells (B cells, T cells, Natural Killer Cells, and Dendritic Cells)