the lymphatic system
returns fluid leaked from blood vessels back to blood
what are the three parts of the lymphatic system?
- lymphatics- vessels
- lymph- fluid in vessel
- lymph nodes- clean the lymph
what do lymphoid tissues and organs do?
immune system by housing phagocytic cells and lymphocytes
what are the lymphoid organs and tissues?
- bone marrow
- thymus
- lymph nodes
- tonsils
- appendex
- Peyer’s patches
- spleen
what are the two lymph vessels?
- lymphatic capillaries -small
2. larger lymphatic vessels
lymphatic capillaries
- blind ended vessels
- NOT in bones, teeth bone marrow and CNS
- increased permeability
- lacteals
what are lacteals
- milky white streaks
- intestines
- absorb fats
larger lymphatic vessels
Captian (capillaries) -vexes (vessels)-three (trunks)-dudes(ducts)
what are the two lymphatic ducts
- right lymphatic duct- right upper arm, R head and thorax
2. thoracic duct- everything else
lymph system
low-pressure system
what are the mechanisms of lymph transport?
- skeletal muscle pump
- pressure changes
- valves
- pulsation of arteries
- lymphatic smooth muscle
lymphangitis
inflammation of large lymph vessels
appear as painful red lines
lymphedema
severe swelling, prevents normal return of lymph to blood
lymphoid cells consist of?
- immune cells in tissue
2. supporting cells that form lymphoid tissue
lymphocytes
adaptive immune system, mature into T or B cells
T cells
thymus, young, immune response kills cells
B cells
bone marrow, becomes plasma cells to secrete antibodies
macrophages
eats pathogens
dendritic cells
immune system
reticular cells
build reticular connective tissue with loose space for fluid
what are the two main types of lymphoid tissues
- diffuse lymphoid tissue
2. lymphoid follicles- germinal centers that proliferate B cells
primary lymphoid organs
T and B cells mature, bone marrow and thymus
secondary lymphoid organs
No TAPS
where are lymph nodes
deep in connective tissue in clusters
