Chapter 22- Lymphatic System Flashcards
lymphatic vessels carry what
lymph - many RBCs, no color, few nutrients
lymphoid organs
spleen, lymph nodes, RBM, thymus
functions of lymphatic system
- return excess fluid to heart
- absorb lipids in small intestine and send them to cardiovascular system
- respond to antigens with specific immunity
b cells
mature in RBM, humoral immunity
t cells
mature in thymus, cellular immunity
edema
fluid accumulation in a body part
lacteal
a specialized lymphatic capillary
chyte
lymph in the lacteal of the small intestine
lymph flow beginning at lymphatic capillaries in tissues
lymphatic capillaries in tissues -> lymphatic vessels -> thoracic/right lymphatic duct -> subclavian veins -> superior vena cava
type of cell in the thymus
lymphocytes that mature into T cells
types of cells in lymph nodes
B lymphocytes, macrophages, follicular dendritic cells, plasma cells
types of cells in the spleen
lymphocytes, macrophages, plasma, granulocytes, RBCs
examples of lymphatic nodules in the body
tonsils, Peyer’s patches, MALT
1st line of immunity defense
barrier to entry and biological processes (intact skin, urination, lacrimation, resident flora)
2nd line of immunity defense
inflammation (histamine released by tissue cells/WBCs, active phagocytosis)
3rd line of immunity defense
specific immunity (T lymphocytes produce immune active cells, B cells produce antibodies)
MHC
the cell “marker” NOT on RBCs
pyrogens
inhibits growth of certain pathogens, increased immunity, reduce availability of iron, increased temperature
interferons
protein molecules produced by viruses, inhibit cancer growth
complement system
composed of 20 or more protein components existing in blood in inactive form, activated by pathogens, inflammatory factors to assist in immunity
IgG
main antibody in circulation, can cross placenta, blood
IgM
first and largest antibody “macro”
IgA
antibody found in secretions like breast milk and saliva
IgE
antibody involved in allergic reactions
