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).
Rating Newest Oldest. Best Answer: Veins need valves to create pressure to pump the blood to the heart. Blood flows away from the heart and, therefore, the pressure is not required. Simplistically, think of the effort it takes to run up a hill, and and how much easier it is to run down it.eins has valve to prevent the back flow of deoxygenated blood to the organ because veins carry blood away to the organs, while artery has to caryy blood along the gradient hence doesnot hv valves.