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BIO 121 - Lymphatics

BIO 121 - Lymphatics - The Lymphatic System Chapter 23...

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The Lymphatic System – Chapter 23 Contains vessels, lymph, lymphatic tissues, and lymphatic organs Vessels originate in the peripheral tissues and deliver lymph to the venous system Functions: Provides an alternate route for transport of nutrients Very important role in maintaining normal blood volume Key player in the immune system, teaching and training the immune cells to new and novile threats to the body Lymph-consists of interstitial fluid resembles blood plasma but has different protein conc Lymphocytes- cells responsible for immune response Macrophages involved in body defenses Organs- spleen, lymphoid associated tissues, thymus, tonsils Primary Functions: 1. Produce, maintain, and distribute lymphocytes: involved in the immune response 2. Maintain normal blood volume and eliminating local variations -distended stomach: lymphatic system cant maintain the balance of fluids; fluid builds up and pools in the abdominal cavity and legs -parasitic infections: elephantitis causes legs, and sometimes, arms to become extremely large: lymphatic vessels become blocked and lymph builds up 3. Provide an alternative route for the transport of hormones, nutrients, waste products Lymphatic capillaries: Tend to flow parallel to blood vessels Very low pressure system have system of valves to ensure lymph flows in the proper direction Tend not to have muscles surrounding them: fluid pumping requires body movement
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