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Vasa Recta is the name given to blood vessels supplying the medullary region of the kidney. They are arranged in a U configuration but flow is opposite to that of the Loop of Henle. The blood vessels descend from the cortex down into the medulla. Its supplies the nutrients and oxygen the Loop of Henle needs.
As blood passes out of the capillary beds of the body it is collected by veins that return the deoxygenated blood to the heart. The superior and inferior vena cavae return deoxygenated venous blood to the right atrium of the heart. Heart valves function to ensure a one-way flow of blood through the heart. The valves are not made of muscle, but rather are composed of sheets of tough connective tissue (leaflets) that act like flaps.