Lymphatic System
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 to the venous circulation. 3. Defense * Microorganism and other foreign substance are filtered from lymph by lymph nodes and from blood by the spleen.
Anatomy of the lymphatic system A. Lymphatic capillaries and vessels * Lymphatic vessels carry lymph away from the tissues. Valves in the vessel ensure the one-way flow of lymph. * Skeletal muscle contraction, contraction of lymphatic vessel smooth muscle, and thoracic pressure changes move the lymph through the vessels. * The thoracic duct and right lymphatic duct empty lymph into the blood.
B. LYMPHATIC ORGANS * The lymphocytes originates from red bone marrow and are carried by the blood to lymphatic organs, the lymphocytes divide and increase in number when the body is exposed to microorganisms or foreign substances. * Lymphatic tissue has very fine reticular fibers; these fibers form an interlaced network that holds the lymphocytes and other cells in place. * Tonsils * Form a protective ring of lymphatic tissue around the openings between the nasal and oral cavities and the pharynx. Has 3 group which are the following: 1. Palatine tonsils – located on each side of the posterior opening of the oral cavity. Usually referred to as the “tonsils”. 2. Pharyngeal tonsil – located near the internal opening of the nasal cavity. When it is enlarged, it is commonly called adenoid. 3. Lingual tonsil – posterior surface of the tongue. * Lymph Nodes
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 to the venous circulation. 3. Defense * Microorganism and other foreign substance are filtered from lymph by lymph nodes and from blood by the spleen.
Anatomy of the lymphatic system A. Lymphatic capillaries and vessels * Lymphatic vessels carry lymph away from the tissues. Valves in the vessel ensure the one-way flow of lymph. * Skeletal muscle contraction, contraction of lymphatic vessel smooth muscle, and thoracic pressure changes move the lymph through the vessels. * The thoracic duct and right lymphatic duct empty lymph into the blood.
B. LYMPHATIC ORGANS * The lymphocytes originates from red bone marrow and are carried by the blood to lymphatic organs, the lymphocytes divide and increase in number when the body is exposed to microorganisms or foreign substances. * Lymphatic tissue has very fine reticular fibers; these fibers form an interlaced network that holds the lymphocytes and other cells in place. * Tonsils * Form a protective ring of lymphatic tissue around the openings between the nasal and oral cavities and the pharynx. Has 3 group which are the following: 1. Palatine tonsils – located on each side of the posterior opening of the oral cavity. Usually referred to as the “tonsils”. 2. Pharyngeal tonsil – located near the internal opening of the nasal cavity. When it is enlarged, it is commonly called adenoid. 3. Lingual tonsil – posterior surface of the tongue. * Lymph Nodes