Chapter 22 powerpoint notes - Chapter 22 Lymphatic and...

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Chapter 22 Lymphatic and Immune System I. Disease Resistance A. Nonspecific Resistance (Innate Immunity) 1. Present at birth ad includes defense mechanisms that provide general protection against invasion by a wide range of pathogens B. Immunity (Adaptive Immunity) 1. Involves activation of specific lymphocytes that combat a particular pathogen or other foreign substance C. The body system that carries out immune responses is the lymphatic system II. Lymphatic System A. The lymphatic system consists of several structures and organs that contain lymphatic tissue, bone marrow, and a fluid called lymph that flows within lymphatic vessel III. Components of the Lymphatic System IV. Functions of the Lymphatic System A. The lymphatic system functions to: 1. Drain interstitial fluid 2. Transport dietary fats 3. Carry out immune responses V. Lymphatic Vessels and Capillaries
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A. Lymphatic vessels begin as lymphatic capillaries, which are closed on one end 1. Lymphatic capillaries are located between cells of many tissues 2. Lymphatic capillaries merge to form lymphatic vessels, which have thin walls and many valves VI. Lymph Trunks and Ducts A. From the lymphatic vessels, lymph passes through lymph nodes and then into lymph trunks 1. Lymph trunks include the lumbar, intestinal, bronchomediastinal, subclavian, and jugular trunks B. Lymph trunks then merge to form either the thoracic duct or the right lymphatic duct VII. Routes of Drainage VIII. Formation and Flow of Lymph 2
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A. Interstitial fluid à lymph capillaries à lymph vessels à lymph trunks à lymph ducts à subclavian veins IX. Lymphatic Organs and Tissues A. Primary lymphatic organs are organs where immune cells become immunocompetent 1. Red bone marrow 2. Thymus B. Secondary lymphatic organs and tissues include: 3
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