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).
Varicose veins are swollen, twisted, and enlarged veins that you can see under the skin. They are often red or blue in color. They usually appear in the legs, but can occur in other parts of the body. Normally, one-way valves in your leg veins keep blood moving up toward the heart.