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).
Which of the following is true about veins. A) Veins have valves; arteries do not. Answer(A) Veins have valves arteries do not B) Veins carry blood away from the heart, while arteries carry blood to the heart. C) Veins have a smaller diameter lumen than arteries. D) Veins are more muscular than arteries.