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