16-1 chapter 16 the lymphatic and immune system resistance is the ability to ward off disease...
TRANSCRIPT
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Chapter 16The Lymphatic and Immune System
• Resistance is the ability to ward off disease– lack of resistance is termed susceptibility
• Nonspecific resistance to disease– general defensive mechanisms effective on a wide
range of pathogens (disease producing microbes)
• Specific resistance or immunity is ability to fight a specific pathogen– cell-mediated immunity– antibody-mediated immunity
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Lymphatic System
• Organs, vessels and a fluid called lymph– similar to interstitial fluid
• Organs involved– red bone marrow– thymus– spleen– lymph nodes– diffuse lymphatic tissue
• tonsils, adenoids & peyers patches
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Functions of the Lymphatic System
• Draining excess interstitial fluid & plasma proteins from tissue spaces
• Transporting dietary lipids & vitamins from GI tract to the blood
• Facilitating immune responses– recognize microbes or abnormal cells &
responding by killing them directly or secreting antibodies that cause their destruction
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Lymphatic Vessels & Circulation
• Capillaries that begin asclosed-ended tubes foundin spaces between cells
• Combine to form lymphaticvessels– resemble veins with thin
walls & more valves• Fluid flows through lymph nodes
towards large veins above the heart– lymph emptied into
bloodstream
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Lymphatic Capillaries
• Found throughout thebody except in Avasculartissue (cartilage, epidermis& cornea)
• Structure is designed to lettissue fluid in but not out– anchoring filaments keep tube
from collapsing under outside pressure– overlapping endothelial cells open when tissue
pressure is high (one-way valve)
• In GI tract, known as lacteals -- contain chyle
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Lymph Trunks & Ducts
• Vessels unite to form trunks & thoracic ducts• Right side head, arm & chest empty into right lymphatic duct and rest of body empties
into thoracic duct
• Lymph is dumped directly into left & right subclavian veins
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Formation & Flow of Lymph
• Fluid & proteins escaping from vascular capillaries is collected by lymphatic capillaries & returned to the blood
• Respiratory & muscular pumps promote flow of lymphatic fluid
• Lymphatic vessels empty into subclavian veins
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Lymphatic Organs & Tissues
• Widely distributed throughout the body
• Primary lymphatic organs– provide environment for stem cells to divide &
mature into B and T lymphocytes• red bone marrow gives rise to mature B cells
• thymus is site where pre-T cells from red marrow mature
• Secondary lymphatic organs & tissues– site where most immune responses occur
• lymph nodes, spleen & lymphatic nodules
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Thymus Gland
• Large organ in infants (70 g) but atrophied as adult (3 g)
• 2 lobed organ located in mediastinum
• Capsule & trabeculae divideit into lobules
• Each lobule has cortex &medulla
• Cortex– tightly packed lymphocytes &
macrophages
• Medulla– reticular epithelial cells
produces thymic hormones– Hassall’s corpuscles
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Lymph Nodes
• Flow is in one direction
– afferent vessels lead in
– sinuses lead to efferent vessels that exit at hilus
• Only nodes filter lymph
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Lymph Nodes• Bean-shaped organs, up to 1 inch long, located along lymphatic vessels
– scattered throughout body but concentrated near mammary glands, axillae & groin
• Stroma is capsule, trabeculae & reticular fibers• Parenchyma is divided into 2 regions:
– cortex• lymphatic nodules with germinal centers containing dendritic cells
– antigen-presenting cells and macrophages
• B cells proliferate into antibody-secreting plasma cells
– medulla• contains B cells & plasma cells in medullary cords
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Metastasis Through Lymphatic System
• Characteristic of malignant tumors
• Spread of disease from one organ to another– cancer cells travel via blood or lymphatic system– cells establish new tumors where lodge
• Secondary tumor sites can be predicted by direction of lymphatic flow from primary site
• Cancerous lymph nodes are firm, enlarged and nontender -- infected lymph nodes are not firm and are very tender
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Spleen
• 5 inch organ between stomach & diaphragm
• Hilus contains blood & lymphatic vessels
• Stroma consists of capsule, trabeculae, fibers & fibroblasts
• Parenchyma consists of white pulp and red pulp– white is lymphatic tissue
(lymphocytes & macrophages) around branches of splenic artery
– red pulp is venous sinuses filled with blood & splenic tissue (splenic cords)
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Lymphatic Nodules
• Concentrations of lymphatic tissue not surrounded by a capsule scattered throughout connective tissue of mucous membranes– mucosa-associated lymphoid tissue (MALT)
• Peyer’s patches in the ileum of the small intestine
• Appendix
• Tonsils form ring at top of throat– adenoids (pharyngeal tonsil)– palatine tonsils (on each side wall)– lingual tonsil in the back of the tongue
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Principal groups of lymph nodes
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Developmental Anatomy
• Begins to develop by 5thweek
• Lymphatic vessels developfrom lymphatic sacs thatarise from veins
• Jugular sac & cisterna chyliform thoracic duct
• Sacs develop into lymph nodes• Spleen develops in gastric mesentery• Thymus is outgrowth of 3rd pharyngeal pouch
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Tumor Immunotherapy
• Cells with antitumor activity are injected into bloodstream of cancer patient– culture patient’s inactive cytotoxic T cells with
interleukin-2– called lymphokine-activated killer cells (LAK)
• Can cause tumor regression, but has severe complications
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Aging
• More susceptible to all types of infections and malignancies
• Response to vaccines is decreased
• Produce more autoantibodies
• Reduced immune system function– T cells less responsive to antigens
– age-related atrophy of thymus– decreased production of thymic hormones
– B cells less responsive– production of antibodies is slowed
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• AIDS/HIV• Allergic Reactions• Lymphomas• Infectious
Mononucleosis
Human immunodeficiency virus (HIV),the causative agent of AIDS.