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Lymphatic System


lymphatic system the lymphatic vessels, and the lymphoid tissues and organs including lymph nodes.
edema an abnormal accumulation of fluid in body parts or tissues; causes swelling.
lymphatic vessels form an elaborate drainage system that picks up this excess tissue fluid and returns it to the blood.
lymph the watery fluid in the lymph vessels collected from the tissue spaces
lymphatics form a one-way system, and lymph flows only toward the heart.
lymph capillaries weave between the tissue cells and blood capillaries in the loose connective tissues of the body, and absorb the leaked fluid
lymphatic collecting vessels lymph is transported from the lymph capillaries through successively larger lymphatic vessels
right lymphatic duct drains the lymph from the right arm and the right side of the head and thorax
thoracic duct receives lymph from the rest of the body
lymph nodes a mass of lymphatic tissue
macrophages cell particularly abundant in lymphatic and connective tissues; important in the immune response as an antigen presenter to T cells and B cells.
lymphocytes agranular white blood cells formed in the bone marrow that mature in the lymphoid tissue
cortex the outer surface layer of an organ
follicles collection of lymphocytes in a lymph node
germinal centers dark-staining centers
medulla the central portion of certain organs
afferent lymphatic vessels lymph enters the convex side of a lymph node through this.
sinuses a dilated channel for passage of blood or lymph
hilum a depressed area where vessels enter and leave an organ
efferent lymphatic vessels lymph exits from the node at its indented region, via this.
lymphoid organs organs in the lymphatic system including lymph nodes, spleen and tonsils
spleen a soft, blood-rich organ that filters blood.
thymus an endocrine gland active in the immune response
tonsils small masses of lymphoid tissue that ring the pharynx, where they are found in the mucosa.
tonsillitis tonsils that become congested with bacteria and become red, swollen, and sore.
Peyer's patches resemble tonsils, are found in the wall of the distal part of the small intestine.
appendix a wormlike extension of the large intestine.
mucosa-associated lymphoid tissue Peyer's patches, the appendix, and the tonsils are part of the collection of small lymphoid tissue
Created by: lorettabritton