6. the lymphatic system Flashcards
autoimmune diseases are when
immune system loses ability to distinguish vetween self-antigens and foreign antigens
active immunity
when B cells encounter antigens and produce antibodies against them. It is eithe naturally acquired during infection or artificially through vaccines
macrophages:
act as antigen presenters- produced in bone marrow,
the common 2 features of the lymphoid organs
a predominance of reticular connective tissue and lymphocytes
lymph nodes are:
lymphoid tissue. Help to protect the body by removing foreign material such as bacteria and tumor cells from lymphatic stream and by producing lymphocytes that functions in the immune response
inflammation in 4 steps
- injury 2. cells release chemical mediators such as histamine 3. these mediators make sure to increase bood flow, promote leaky vessels, start to call neutrophils, and monocytes and WBCs. 4. bringi n cells required for defence as well as tissue repair
lymphocytes are
B cells, T cells and macrophages
they thymus gland
education on T cells (it atrophies after childhood)
MALT- mucosal associated lymphoid tissue is found where:
tonsils, peyer’s patch (GALD), appendix
the spleen produces ______ in adults and _____ in fetus
lymphocytes - hematopoiesis
the spleen
the blood filter and reservoir. produces lymphocytes, hematopoiesis in fetus,
lymphatic organs
spleen, thymus gland, MALT * tonsils, peyers patch, appendix
an edema is
fluid retention in the interstitual space
B cells in the lymph nodes make:
plasma cells, which release antibodies
phagocytic macrophages
engulf and destroy bacteria, viruses, and other foreign substances in the lymph before it is returned to the blood
