50643479system

50643479system - Lymphatic System Functions of Lymphatic...

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Lymphatic System Functions of Lymphatic System 1. Body’s defense system against microorganisms and other harmful substance Microorganisms and other foreign substances are filtered from lymph to the lymph nodes and from blood by the spleen. Lymphocytes are capable of destroying microorganisms and foreign substances 2. Maintains fluid balance 3L of lymph enters to the lymphatic capillaries lymphatic vessels returns to blood Lymph contains solutes from 2 sources a.Substance in plasma such as ions, nutrients, gases and some proteins that pass from blood capillaries into the interstitial space b. Substances such as hormones, enzymes and waste products that is derived from cells 3. Fat absorption Lacteals are located in the small intestine linings. Fat enters to the lacteals and pass through the lymphatic vessels to the venous circulation Chyle - lymph that has a milky appearance due to fat content Characteristics of Lymphatic Capillaries and Vessels Lymphatic system carries fluid in one direction from tissues to the circulatory system.
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Lymphatic capillaries are tiny closed ended valve consisting of simple squamous epithelium Lymphatic vessels are more permeable than blood capillaries because it lacks basement membrane and fluids move easily . Overlapping squamous cells of lymphatic capillary walls acts as valve to prevent fluid backflow Lymphatic capillaries joins to form the lymphatic vessels which resembles small veins. Small lymphatic vessels have small beaded appearance that resembles the one way valve of veins When a lymphatic vessel is compressed, backward movement of lymph is prevented and consequently causes lymph to move forward Three factors that causes compression 1. Contraction of the surrounding skeletal muscle during activity 2. Periodic contraction of smooth muscle in the lymphatic vessel wall 3. Pressure changes in the thorax during respiration Lymphatic vessels converge and empty into the blood at two locations of the body Lymphatic vessels from the upper right limb and the right half of the head, neck and chest froms the right lymphatic duct which empties into the right subclavian vein. Lymphatic vessels from the rest of the body enter the thoracic duct and empties into the left subclavian vein Lymphatic organs Lymphatic organs includes tonsils, lymph nodes, spleen and thymus glands Lymphatic tissue consists of lymphocytes and other cells such as macrophages that are found within lymphatic organ Tonsils
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Form the protective ring of the lymphatic tissue around the openings between the nasal, oral cavities and the pharynx There are three groups of tonsils 1. Palatine located on each side of the posterior opening of the oral cavity 2. Pharyngeal tonsils located near the internal opening of the nasal cavity 3. Lingual tonsils located posterior to the tongue Organization and structure of the lymphatic vessels One way network in which their contained lymph flows from the lymphatic capillaries to the ducts and finally towards the heart 1. Lymphatic capillaries
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50643479system - Lymphatic System Functions of Lymphatic...

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