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Lymphatic and Immune Systems.docx

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Course Code
BIOL 301
Vivian Dayeh

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Lymphatic and Immune Systems ­ one way travel system ­ lymphatics contain:  o vessels o organs(lymphatic tissue plus cells) o fluid (going to flow through)  ­ function:  o transport fluid ▯ lymph(fluid)   return tissue fluid and proteins to blood   collect excess fluid from loose CT aroung blood capillaries and  return it to the bloodstream  a one­way system▯fluid flows only toward the heart  o immune response ▯ protection from pathogen  o edema = blockage of lymphatic vessels causing affected body region to  swell with excess tissue fluid Lymphatic vessels Lymphatic capillaries Smallest lymph vessels F ▯ irst to receive  lymph High perm for tissue fluid and protein  molecules. Also bacteria, virus, cancer  cells  Specialized lymphatic capillaries  ▯ lacteals (only in villi of small intestines)  ­ receive digested fats (milky  white) ­ fatty lymph = chyle  Lymphatic collecting  Collect from lym.  Lymph nodes scattered along collection  vessels  Capillaries  vessels  Collecting vessels accompany BVs Have same three tunics as BVs  Contain more valves than veins ▯ one­ way flow  Lymph propelled by: ­ skeletal muscles bulging, nearby  arteries pulsing  ­ tunica media of the lymph vessels ­ unaided by heartbeat  Lymph nodes  Deep  Cleanse lymph of pathogens  1. superficial located in:  superficial ­ cervical(receive lymph form head  and neck), axillary(underarm),  and inguinal regions(superior  thigh) 2. deep nodes(can’t palpate):  ­ tracheobronchial(thoracic  viscera), aortic(posterior  abdominal wall), and iliac lymph  nodes(pe
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