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| carry blood away from the heart, have a rigid structure, mostly composed of elastic fibers & smooth muscle, which allow for elasticity & contractility (oxygenated blood) |
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| carry blood toward the heart, are relatively thin, not rigid, have one-way valves to aid in blood return against gravity (unoxygenated blood) |
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| middle layer, thickest layer in arteries |
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| outermost layer, thickest layer in veins |
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| hollow center of a blood vessel, the "hole" that fluid moves through |
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| small arteries, blood flows into these from the larger arteries |
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| network of vessels that permit the exchange of nutrients & waste between the blood & the cells, one cell layer thick (NOT ARTERIES OR VEINS) |
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| small veins, blood flows into these from capillaries, they drain into larger vein |
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| an extensive pathway of tube-like vessels connected to a web-like network, which facilitates diffusion of materials across a concentration gradient |
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| runs parallel to the circulatory system, assists in circulating body fluids, & helps defend against disease-causing agents |
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| functions of the lymphatic system |
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| drains excess interstitial fluid from tissue spaces & returns it to the blood; transports dietary lipids, lipid-soluable (A,D,E,K) & water soluable (B,C); carry out immune responses - initiate highly specific responses directed against particular microbes or abnormal by(usually cancerous) cells, facilitated by lymphocytes aided by macrophages |
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| carry lymph fluid, follow the circulatory system |
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| drain interstitial fluid from tissues |
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| lymph vessels eventually converge on one of two main collecting ducts |
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| receives lymph from only the upper right side of the body, empties into the junction of the right internal jugular vein & right subclavian vein |
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| the main collecting duct of the lymphatic system, receives lymph from the entire left side of the body & the right side below the waist, drains into the junction of the left internal jugular & left subclavian vein |
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| the beginning of the thoracic duct, located in the abdomen |
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| masses of lymphatic tissue scattered throughout the body along the lymph vessels. composed of B cells, T cells, & macrophages. functions in immune response & filters lymph of debris for phagocytosis |
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| a ring of 5 lymphatic nodules in the throat which fight against inhaled or ingested foreign substances |
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| armpit, groin, neck, behind knee, under tongue |
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| largest mass of lymphatic tissue, located between stomach, diaphragm, kidney, & pancreas *largest lymphatic organ in the body |
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| removal of worn out blood cells, immune response, & storage of platelets |
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| located between the lungs, rests around the trachea. site of maturation of T lymphocytes (T-cells) *shrinks as we get older |
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