Lymphatic System and Lymphoid Organs Flashcards
What is the role of the lymphatic system
return leaking fluids from the blood vessels back into the bloodstream.
What are the 3 components of the lymphatic system
lymphatic vessels
lymph
lymph nodes
What problem does the lymphatic vessels remedy?
lymphatic vessels collect the extra fluid ( becomes lymph) bc blood capillaries leak fluid into extracellular tissue sites and that fluid has to be returned.
What is the flow of the lymph
lymph only flows in the direction of toward the heart
Define lacteals
transport fat from small intestines to bloodstream. Contains milky white lymph called chyle that flow into cisterna chyli
What are the 5 major lymphatic trucks
lymbar bronchomediastinal subclavian jugular trunks intestinal trunk
What are the 2 lymphatic ducts
right lymphatic duct
thoracic duct
Where does the right lymphatic duct drain to
drains lymph from the right upper limb and right side of head and the thorax
Where does the thoracic duct drain into
receives lymph from rest of body. starts at the cisterna chyli
What are the 2 supporting lymphoid cells
dendritic cells
reticular cells
What is the job of the dendritic cells
process ( engulf) antigen and give them to the T cells
What is the job of the reticular cells?
produce reticular collagen fibers which support lymphoid organs and tissues
What organs are part of the primary lymphoid organs and what are there jobs
Red bone marrow: origin and where B cells mature
thymus: where T cells mature
What 5 organs are part of the secondary lymphoid organs?
lymph nodes spleen tonsils peyer's patches in small intestines appendix
What is the job of the secondary lymphoid organs
where mature lymphocytes are activated.1st encounter of antigens
What is the function of the primary lymphoid organs
places where B cells and T cells develop
What are 3 characteristics of secondary lymphoid organs
1) reticular fiber network
2) presence of lymphoid follicles
3) germinal centers: where B lymphocytes multiply
What is the difference between primary and seconday lymphoid follicles(2)
primary: “resting” follicles
secondary: “ active “ follicles. develops an immune response and develops germical centers
What is a germinal center
where b lymphocytes multiply
Where are lymph nodes located?
located along routes where lymphatic vessels to truck
i.e inguinal
axillary
cervical
What are the 2 major functions of lymph nodes
1) Cleansing the lymph ( contains many immune cells)
2) Immune system activation
Identify the structures of a lymph node and the order the lymph flows through?
Enters afferent vessels
then through subcapsular sinuses
into cortex then passes through lymphoid follicles
in follicles lymph passes through germinal centers…flowing into the medulla and through the medullary sinus
finally lymph exits through the efferent vessels at the hilum
What is located in the subcapsular sinuses
has dendritic cells, macrophages
is where reticular fibers are located
What is the medulla full of
B cells
