Veins return blood from the remainder of the physique to the heart. To return blood to the guts, the veins during the legs will have to do the job versus gravity. Weakened valves, also referred to as incompetent valves, inside the veins might cause varicose veins. تنقبض العضلات الموجودة في https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-answers-to-your-most-common-questions/