2. How the Blood Flows

Veins have to help blood travel against gravity, a practice that requires special mechanisms called valves. Deep veins use these unidirectional valves to ensure blood goes to the heart and doesn't backflow. Muscles contractions help blood move through the veins. Arteries don't need valves. They are strong and thick, which helps them to work with the pressure from a pumping heart that pushes blood in one direction.

arteries and veins valves

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