Chapter 22 - Lymphatic System Flashcards
Lymphatic capillaries have a ________ structure, and allow interstitial fluid to flow in but not out.
One-way
What is the flow of the lymphatic fluid?
Capillary –> Lymphatic Vessel –> Lymph Node –> Trunk –> (Left or Right Lymphatic) Ducts –> Subclavian Vein
What do lymphatic capillaries form that have thinner walls and more valves than veins?
Larger lymphatic vessels
What do lymphatic vessels pass through?
Lymph nodes
What are lymph nodes and what do they function as?
Encapsulated organs with masses of B and T cells.
-Function as lymph filters
What does an obstruction or malfunction of lymph flow lead to?
Edema - swelling (fluid accumulation in interstitial spaces)
What are the primary lymph organs?
Bone marrow and Thymus
-Where stem cells divide and become immunocompetent
What are the Secondary Lymphatic organs?
The spleen, lymph nodes, and other lymphoid tissues such as the tonsils
-Where immune responses occur
Outer cortex of the thymus:
Immature T cells
-Cannot mount an immune response
What causes immature T cells from the Thymus to mature through positive selection?
Dendritic Cells
What is the inner medulla composed of?
More mature T cells
-Can mount an immune response
Five groups of lymph nodes:
Submandibular, Cervical, Axillary, Mediastinal, Inguinal
Where does lymph fluid enter the lymph node?
The afferent vessels
The _________ vessels convey lymph, antibodies, and activated T cells out of the node at the indentation called the ________.
Efferent; Hilum
What is the body’s largest mass of lymphatic tissue?
Spleen
