lymphatic system

the lymphatic system begins as _______ ________ in the _________ that anastomose and become larger lymphatic vessels

blind capillaries; periphery

major functions of the lymphatic system

fluid control (drain excess interstitial fluid), immunity (produce, maintain, and distribute lymphocytes), transportation (hormones, nutrients, waste products)

the thoracic duct empties lymph into the venous circulation at the junction of the

left internal jugular vein and the left subclavian vein

major components of the lymphatic system

lymph vessels, lymph nodes, thymus gland, tonsils, spleen

3 types of tonsils

pharyngeal, lingual, palatine

5 areas where lymph nodes are gathered

popliteal fossa, inguinal region, neck, along the aorta, axillary region

2 important functions of the lymphatic system

return intercellular fluid to heart; help prevent and fight infection

a major function of the lymphatic system is the

return of interstitial fluid to the cardiovascular system

collects interstitial fluid from upper right portion of body

right lymphatic duct

collects the lymph from the right side of the head, neck, and thorax and the right upper extremity; empties into the right subclavian vein

right lymphatic duct

Which of the following structures is considered a lymphoid organ? Spleen Pancreas Stomach Ovary Parotid gland

spleen

largest lymphatic organ/tissue in the body; produces lymphocytes and filters blood; destroys bacteria and worn-out red blood cells; just posterior to stomach

spleen

largest mass of lymphoid tissue int he body

spleen

site of return of lymph into the cardiovascular system

subclavian veins

collects the lymph from the left half of the body above the diaphragm and all the lower body; empties into the left subclavian vein

thoracic duct

large lymphatic collection duct found in the mediastinum

thoracic duct

lymphatic vessels converge toward the

thoracic duct or right lymphatic duct

located posterior to sternum; assists in the development of the immune system; atrophies and becomes non-functional in adults

thymus gland

collections of lymphoid tissue facing aerodigestive tract

tonsils

found in 3 positions in the head; help immune system respond to infection

tonsils

the lymphatic vessels have ______ and pass through _______ _______

valves; lymph nodes