ANP 1105 Lecture Notes - Lecture 17: Reticular Connective Tissue, Mucosa-Associated Lymphoid Tissue, Lymphocyte

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The lymphatic system consists of two parts: the lymphatic vessels and lymphatic tissues and organs: lymphatic vessels: up to 3l of leaked fluid plus plasma proteins returned to the circulatory system. Everywhere except bones, teeth, bone marrow, cns: lymphatic tissues/organs: essential in the body, aid in defense/resistance to disease. Filaments anchor the endothelial cells to surrounding structures. Right lymphatic duct drains from: right upper arm, head and thorax. Thoracic duct drains from: lower limbs, intestinal trunk, left thorax, upper limb, head. Lymphocytes: t-cells (manage immune response, some are soldiers) and b-cells (plasma cells) Macrophages: phagocytize foreign substances, activate t-cells: lymphoid tissue. Regular connective tissue: all lymphoid organs except thymus. Lymphocytes make temporary stopovers in between patrolling body: houses and provides proliferation sites for lymphocytes, ideal surveillance vantage point for lymphocytes and macrophages, lymph nodes are discrete encapsulated collections of diffuse lymphoid tissue and follicles. They are about 2. 5cm long and are divided into compartments by trabeculae.

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