WASHINGTON, DC - JANUARY 20: U.S. President Donald Trump delivers his inaugural address on the West Front of the U.S. Capitol on January 20, 2017 in Washington, DC. In today's inauguration ceremony Donald J. Trump becomes the 45th president of the United States.
One-Way Valves in the Veins. One-way valves consist of two flaps (cusps or leaflets) with edges that meet. These valves help veins return blood to the heart. As blood moves toward the heart, it pushes the cusps open like a pair of one-way swinging doors (shown on the left).
leg vein problems begin when the vein valves that prevent blood from flowing in the wrong direction reflux become weak or malfunction this causes blood to pool in the veins forcing them to protrude from the skin becoming tortuous or rope like this increased venous pressure can lead to further failure of other vein valves and to the development of varicose veins