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Chapter 14
Lymphatic System
31
Science
Not Applicable
11/08/2011

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Term
Lymphatic System
Definition
Network of vessels that transports fluid. Transports excess fluid away from interstitial spaces and return it to the bloodstream. Immunity.
Term
Lymph
Definition
The fluid inside the lymphatic system, includes microscopic, permeable, blind-ended capillaries, lymphatic collecting vessels, and trunks and ducts.
Term
Minivalves
Definition
One-way gates that allow interstitial fluid to enter lymph capillaries, and do not allow lymph to excape from the capillaries.
Term
What is absorbed during inflammation?
Definition
Lymph capillaries can absorb cell debris, pathogens, and cancer cells.
Term
Cells in the Lymph Nodes
Definition
They cleanse and "examine" debris absorbed during inflammation.
Term
Right Lymphatic Duct
Definition
Drains the right upper arm and the right side of the head and thorax. Empties into the right subclavian vein.
Term
Thoracic Duct
Definition
Arises from the cisterna chyli and drains the rest of the body. Larger and longer and empties into the left sublcavian vein.
Term
Venous System
Definition
Lymph enters from the collecting ducts and becomes part of the plasma.
Term
Lymph Formation
Definition
Filtration from plasma exceeds how much can be absorbed, resulting in excess fluid. This increase in hydrostatic pressure favores movement into the lymphatic capillaries.
Term
Lymph Function
Definition
Returns small proteins filtered by capillaries back to the bloodstream. Moves foreign particles, viruses or bacteria, to the lypmh nodes.
Term
Lymph Transport
Definition
Lymphatic system lacks a pumping organ, low-pressure conduit vessels. Propels lymph the same way as veins do. PUlsations of nearby arteries, contract smooth muscle, muslcular and respiratory pumps and valves.
Term
Antigen
Definition
Anything the body perceives as foreign.
Term
T Cells
Definition
Manage the immune response and attack and destroy foreign cells. From the thymus.
Term
B Cells
Definition
Produce plasma cells, which secrete antibodies and antibodies immobilize antigens. From the red bone marrow.
Term
Lymph Nodes
Definition
Filtration: macrophages destroy microoranisms and debris (cleanse). Immune System Activation: monitor for antigens and mount an attack agains them (examine)
Term
Thymus
Definition
Secretes hormones that cause T lymphocytes to become immunocompetent (able to develop an immune response). As a child it is most activev, but stops growing during adolescence and gradually muscle atrophy comes into play.
Term
Spleen
Definition
Largest lymphoid organ. Site of lymphocyte proliferation, immune surveillance and response, and cleanses the blood.
Term
Peyer's Patches and the Appendix
Definition
Destroy bacteria, preventing them from breaching the intestinal wall. Generate "memory" lymphocytes for long-term immunity.
Term
Innate Defense
Definition
Species resistance, mechanical and chemical barriers, natural killer cells, inflammation, phagocytosis, and fever. Faster response.
Term
Adaptive Defense
Definition
Immunity. Specialized lymphocytes recognize foreign molecules and act against them. 3rd line of defense.
Term
Cellular Immune Response
Definition
T cells attach to foreign antigen presenting cells and interact directly. Cell to cell contact.
Term
Humoral Immune Response
Definition
B cells divide and differentiate into plasma cells. They secrete antibodies or immunoglobulins, which react in various ways to destroy specific antigen presenting cells.
Term
IgG
Definition
Plasma and tissue fluids, bacteria, viruses and toxins, activates complement.
Term
IgA
Definition
exocrine gland secretions: breast milk, tears, snot, gastric and intestinal juice, bile and urine.
Term
IgM
Definition
plasma in response to contact with certain antigens with food or bacteria, activates complement, anti-A and anti-B in blood
Term
IgD
Definition
surface of most B cells, important in activating B cells
Term
IgE
Definition
exocrine secretions with IgA, allergic reactions
Term
Primary Response
Definition
Activation of B or T cells AFTER first encountering the antigens they specialize to react to.
Term
Secondary Response
Definition
Encounter with the antigen after primary response, memory B and memory T cells respond.
Term
Allergic Reaction
Definition
Immune response to a nonharmful substance, allergens trigger allergic responses.
Term
Autoimmunity
Definition
Immune system can't distinguish self from non-self.
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