21/04/2013 Lymphatic System & Immunity Manuel Desco Dept. Bioingeniería Principles of Human Anatomy and Physiology‚ 11e Anatomy and Physiology I 1 INTRODUCTION The ability to ward off the pathogens that produce disease is called resistance – Lack of resistance is called susceptibility Resistance to disease can be grouped into two broad areas – Nonspecific resistance: general defensive mechanisms effective on a wide range of pathogens – Immunity: activation of specific
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LYMPHATIC SYSTEM * Carries fluid in one direction‚ from the tissues to the circulatory system. Functions of the Lymphatic System 1. Fluid Balance * Collecting excess fluid and particulate matter from tissues and depositing them in the bloodstream. 2. Fat Absorption * Absorbs fats and other substance from the digestive tract through lymphatic vessels called lacteals located in the lining of the small intestine. * Fat enters the lacteals and pass through the lymphatic vessels
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pressure. The lymphatic system picks up fluid that leaks out of the capillaries and returns it to the circulation. Lymphatic capillaries start in capillary beds Lymphatic capillaries snake their way through capillary beds to pick up the excess fluid and return it back to the venous circulation. As fluid pressure increases‚ it forces open little flaps in the lymphatic capillaries‚ and the excess fluid enters the lymphatic system. Lymphatic Vessels Lymphatic capillaries lead to lymphatic vessels
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Lymphatic/Immune System Structures: White Blood Cells‚ thymus‚ spleen‚ lymph nodes‚ lymph vessels Function: Helps protect the body from disease‚ helps collect the fluid lost from blood vessels and returns the fluid to the circulatory system Pathogen- Disease Causing Agent Vector- animal that carries pathogens from person to person Bacteria- domain of unicellular prokaryotes that have cell walls containing peptidoglycan Virus- particle made up of nucleic acid‚ protein‚ and in some cases lipids
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Chapter 16-Lymphatic System & Immunity 1. Explain the functions of the lymphatic system. The lymphatic system functions to balance fluid‚ lipid absorption (via lacteals=lymph capillaries) and defense. It removes toxins/pathogens‚ fight infections and transports excess fluid in the interstitial spaces and returns it to the blood stream. Lacteals absorb digested fats from small intestines and transports it to venous circulation. 2. Trace the general pathway of lymph from the interstitial
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Lymphatic System consists of 2 semi-independent parts: 1. Lymphatic vessels—network that carries lymph from peripheral tissues to the venous system 2. Lymphatic tissue and organs—found throughout the body *Lymph system cells—lymphocytes‚ phagocytes and other immune system cells What is Lymph? Fluid derived from plasma/interstitial fluid. Does not have plasma proteins What does the Lymphatic System do? Returns interstitial fluid and leaked plasma proteins to the blood stream It produces‚
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Lymphatic system study guide- complete after listening to lecture and reviewing the vocabulary. 1. This receives lymph from the rest of the body The thoracic duct receives lymph from the rest of the body. 2. Small masses lf lymphatic tissue that rings the pharynx in the throat. Tonsils are small masses of lymphatic tissue that rings the pharynx in the throat. 3. This is literally an ‘eating cell’ such as macrophages and neutrophils. Phagocytic cells are eating cells such as macrophages and
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The Lymphatic System And Immunity The cells‚ tissues‚ and organs of the lymphatic system play a central role in the body’s defenses against a variety of pathogens‚ or disease-causing organisms. Acts against environment hazards‚ various pathogens‚ and internal threats. Lymphocytes (primary cell) are vital to or overcoming infection and disease. Lymphocytes respond to invading pathogens‚ abnormal body cells‚ and foreign proteins. They act to eliminate these threats or render them harmless
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The Immune System: Anatomy Review 1. Name the two major anatomical parts of the immune system: • ________________________________________ • ________________________________________ 2. Cells of the immune system originate in ___________. These cells are called ______________ when traveling in the blood and are classified according to the shape of their nucleus and colors of their granules when stained. 3–4. List the leukocytes in order of frequency from most to least common. In the second column
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GE 259 Lymphatic System June 24‚ 2014 1. What is the significance of a lower-than-normal hematocrit? What is the effect of a bacterial infection on the hematocrit? A lower than normal hematocrit indicates anemia‚ a condition in which the body does not have enough healthy red blood cells. Red blood cells provide oxygen to the body tissues. If you have a bacterial infection‚ your white blood cell count would increase because as the wbc’s are fighting off the infection they die off releasing a
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