Chapter 22: Lymphatic System Flashcards
2 types of immunity
- innate immunity
- adaptive immunity
What does the lymphoid system consist of
several structures and organs that contain lymphatic tissue, bone marrow, and fluid called lymph plasma that flows within lymphatic vessels
Lymph nodes attach to
lymph vessels
Functions of lymphatic system
- drain excess interstitial fluid
- transport dietary fats
- carries out immune responses
Lymphatic vessels begin as
lymphatic capillaries which are closed on one end
Lymph vessels are like veins because
they have valves and the fluid travels only one way
Where does lymph travel to after lymph vessels
lymph plasma passes through lymph nodes and then into lymph trunks
What do lymph trunks include
lumbar trunks, intestinal trunks. bronchomediastinal trunks, subclavian trunks, and the jugular trunks
What do lymph trunks do?
returns lymph plasma to the venous system independently or via merged structures called lymphatic ducts
Lymph plasma enters the venous flow at the
subclavian veins
Formation and flow of lymph
interstitial fluid –> lymph capillaries –> lymph vessels –> lymph trunks –> lymph ducts –> subclavian veins
What are primary lymphatic organs and examples
primary lymphatic organs are organs where immune cells become immunocompetent
- red bone marrow (in long bones)
- thymus
Medulla, cortex, and capsule
- medulla: center
- cortex: outer layer
- capsule surrounds whole
Secondary lymphatic organs and tissues
lymph nodes, spleen, lymphatic nodules
eg: tonsils, aggregated lymphoid follicles, mucosa-associated lymphatic tissue (MALT)
Where do immunocompetent lymphocytes live while they wait for foreign antigens
secondary lymphatic organs and tissues
