The Lymphatic System and Immunit2

The Lymphatic System and Immunit2 - The tonsils protect the...

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The Lymphatic System and Immunity Lymphatic System The lymphatic system consists of lymph, lymphocytes, lymphatic vessels, lymph nodes, tonsils, the spleen, and the thymus gland. Functions of the Lymphatic System The lymphatic system maintains fluid balance in tissues, absorbs fats from the small intestine, and defends against microorganisms and foreign substances. Lymphatic Capillaries and Vessels Lymphatic vessels carry lymph away from tissues. Valves in the vessels 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. Lymphatic Organs Lymphatic tissue produces lymphocytes, when exposed to foreign substances, and it filters lymph and blood.
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Unformatted text preview: The tonsils protect the openings between the nasal and oral cavities and the pharynx. Lymph nodes, located along lymphatic vessels, filter lymph. The white pulp of the spleen responds to foreign substances in the blood, whereas the red pulp phagocytizes foreign substances and worn out erythrocytes. The spleen also functions as a reservoir for blood. The thymus processes lymphocytes that move to other lymphatic tissue to respond to foreign substances. Immunity Immunity is the ability to resist the harmful effects of microorganisms and other foreign substances. Innate Immunity Mechanical Mechanisms o The skin and mucous membranes are barriers that prevent the entry of microorganisms into the body. o Tears, saliva, and urine act to wash away microorganisms....
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This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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