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34 Cards in this Set
- Front
- Back
lacteals
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highly specialized lymphatic capillaries
present in the fingerlike villi of the inestinal mucosa |
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chyle
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fatty lymph
lymph draining from the digestive viscera, delivered to the blood via the lymphatic stream |
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lymphatic trunk
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lumbar trunk
bronchomediastinal trunk subclavian trunk jugular trunk intestinal trunk |
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right lymphatic duct
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drains lymph from the right upper arm and the right side of the head and thorax
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thoracic duct
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receives lymph from the rest of the body
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Lymphocytes are produced in
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red blood marrow
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Lymphocytes mature into
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T cells or B cells
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function of the T cells
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manage the immune response, some of them directly attack and destroy infected cells
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function of the B cells
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protect the body by producing plasma cells
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dendritic cells
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capture antigens and bring them back to the lymph nodes
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reticular cells
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fibroblast-like cells that produce the reticular fiber stroma
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stroma
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the network that supports the other cell types in the lymphoid organs
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lymphoid tissue functions
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houses and provides a proliferation site for lymphocytes
furnishes an ideal surveillance vantage point for lymphocytes and macrophages |
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lymphoid tissues are composed of
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reticular connective tissue
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lymphoid follicles (nodules)
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lack a capsule
have lighter-staining centers called germinal centers |
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lyph node functions
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act as lymph "filters"
help activate the immune system |
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the 2 regions of a lymph node
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cortex (superficial part)
medulla |
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medullary cords
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thin inward extensions from the cortical lymphoid tissue
define the medulla |
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lymphoid organs are composed of
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reticular connective tissue
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spleen's most important function
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blood cleansing (extracts aged and defective blood cells and platelets from the blood)
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spleen's other three functions
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salvages iron for making hemoglobin
is a site of erythrocyte production in the fetus stores blood platelets |
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white pulp
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spleen
areas composed mostly of lymphocytes suspended on reticular fibers |
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white pulp function
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involved with the immune functions of the spleen
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red pulp
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all remaining splenic tissue, the venous sinuses, and the splenic cords
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red pulp function
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disposing of worn-out red blood cells and bloodborne pathogens
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thymus location
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in the inferior neck and extends into the superior thorax
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thymus functions
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T lymphocyte maturation
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tonsils function
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gather and remove many of the pathogens entering the pharynx in the food or in inhaled air
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palatine tonsils locaiton
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on either side at the posterior ends of the oral cavity
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lingual tonsils location
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a lumpy collection of lymphoid follicles at the base of the tongue
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pharyngeal tonsil location
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in the posterior wall of the nasopharynx
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tubal tonsils location
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surround the openings of the auditory tubes into the pharynx
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Peyer's patches location
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in the wall of the distal portion of the small intestine
in the wall of the appendix |
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Peyer's patches function
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to destroy bacteria
to generate "memory" lymphocytes for long-term immunity |