Veins By: Nathan Van Belle

Description and System Are tubular structures Largest blood carrying structures along with the arteries Have valves to prevent backflow of blood Part of the Circulatory system

Function Mostly carry deoxygenated blood except for the pulmonary veins Always carry blood to the heart never carry blood away Always have lower pressure than arteries Works against gravity Have thinner walls More inside area Pump to the heart by muscles surrounding vein contracting and valves opening and closing to prevent the backflow of blood

Impediments Thrombosis-a clot in the blood stream that blocks the blood vessel This can be corrected by taking one of many types of drugs some of them being blood thinners Varicose veins-the swelling of veins because of the valves not working and the blood pooling

References http://www.communitycare.com/Practices/Interventional_Radiol ogy/leg_vein_treatments.asp http://medical-dictionary.thefreedictionary.com/thrombosis http://dictionary.reference.com/browse/veins http://www.rightdiagnosis.com/symptom/vein-problems.htm