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Through a series of intricate pathways, capillaries and tunnels, the vasa recta help the kidney produce concentrated urine. The vasa recta contain a group of capillaries and vessels located in the kidneys. Biologically, the vasa recta lay parallel to the loop of Henle, which facilitates the flow of blood into and out of the kidneys. Keep Learning.
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.