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Functions of Lymphatic System
1. drain excess interstitial fluid, 2. transport dietary lipids, 3. carry our immune responses
Lymphatic System consists of
lymph, lymphatic vessels, number of structures & organs, red bone marrow
Capillaries unique because
vessel's unique one-way structure permitting interstitial fluid to flow into them
lymph flow is also maintained by pressure changes occurring during inhalation, trunks drain lymph
Lymph's way of travel
lymph enters afferent lymphatic vessels & drains through efferent lymphatic vessels
participate in immune response, small & solitary, some occur in large aggregates (tonsils)
Lymphatic nodules also called
Mucosa-Associated Lymphatic Tissue (MALT) because plentiful in mucus membranes
First Line of Defense helps
physical & chemical barriers discouraging foreign substances from penetrating body
plasma membrane of phagocyte extends projections (pseudopods) engulfing microbe, surrounding w/ phagosome
phagosome fuses w/ lysosomes to form phagolysosome & lysosomal enzymes breakdown ingested cell
causes perforations in plasma membrane & cytolysis movement of extracellular fluid to rush into cell
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