BIOLOGY 174 Lecture Notes - Lecture 13: Hemoglobin, Thymosin, B Cell
23 Feb 2017
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Function of lymph nodes: filters, purifies, cleanse lymph as it passes through, add lymphocytes to lymph (defense) Lymph is delivered to the left and right subclavian veins by two large lymphatic trunks. Two locations where lymph is returned to circulatory system: right lymphatic duct. Receives lymph from lymphatic vessels on right side of body above diaphragm and drains it into the right subclavian vein: left lymphatic duct. Carries lymph from left side of body and right side below diaphragm and drains into left subclavian vein. Lymphoid tissues (ct dominated by lymphocytes; not surrounded by a fibrous ct capsule: tonsils. Location: 1 pharyngeal tonsil (adenoid, 2 palatine tonsils, 2 lingual tonsil (base of tongue) Function: defend against invaders (lymphocytes, not vital, malt = mucosa associated lymphoid tissue. Lymphatic tissue present in epithelia: ex. Digestive system: respiratory system, urinary system, reproductive system, ex. Appendix: digestive tra(cid:272)t: peyer"s pat(cid:272)hes, function: defense.
