Chapter 10 Flashcards
components of lymphatic system
- lymph: the fluid
- lymphatics: the vessels
- spleen and thymus
functions of lymphatic system
- return fluid to the bloodstream
- transports fats from digestive tract to the bloodstream
- surveillance and defense
- originate as lymph capillaries
- capillaries unite to form larger vessels
- resemble veins in structure
- connect to lymph nodes at various intervals
lymphatics
lymphatics ultimately deliver lymph into 2 main channels
right lymphatic duct and thoracic duct
- drains right side of head & neck, right arm, right thorax
- empties into the right subclavian vein
right lymphatic duct
- drains the rest of the body
- empties into the left subclavian vein
thoracic duct
who’s in charge with the flow of lymph fluid
muscle movement and contraction
the fluid the lymphatic system collects comes from…
cells and tissues throughout the body
the lymphatic system is part of the immune system. It produces and releases [ ] (white blood cells) and other immune cells that monitor and then destroy the
foreign invaders
lymphocytes
job of the spleen
- fight invading germs in blood
- controls levels of blood cells
- filters blood
composition of diffuse lymphatic tissue
lymphocytes and macrophages associated with a reticular fiber network
location of diffuse lymphatic tissue
lamina propria (middle layer) of the mucus membranes (mucosae) that line the respiratory and gastrointestinal
tracts.
- no capsule present
- oval-shaped masses
- found singly or in clusters
lymphatic nodules
- capsule present
- lymph nodes, spleen, thymus gland
lymphatic organs
lymph nodules has [ ] that separate them from neighboring cells
clear boundaries
lymph cells are also referred as…
mucosa-associated lymphoid tissue (MALT)
lymphatic nodules contain
lymphocytes and macrophages
major clusters of nodules
- peyer’s patches: small intestine
- tonsils: throat
- appendix: large intestine
nodule vs. node
- nodule is smaller and does not have a well-defined connective-tissue capsule as a boundary.
- does not function as a filter, because it is not located along a lymphatic vessel.
composition of lymph organs
encapsulated organs contain lymphatic nodules and diffuse lymphatic cells surrounded by a capsule of dense connective tissue.
- oval structures located along lymphatics
- enclosed by a fibrous capsule
lymph nodes
located at the cortex and produces lymphocytes
germinal centers
the inner portion medulla contains [ ]
medullary cords
lymph enters nodes through [ ] lymphatics, flows through sinuses, exits through [ ] lymphatic
afferent; efferent