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-HADLEY cell circulates air between topics and subtropics (approximates real world well). Warm air rises at the equator-As the flow moves poleward, it begins to cool and sinks at 20Â°-35Â° latitude.-Trade winds meet at the equator, in a region with a weak pressure gradient, called the doldrums.-FERREL cell circulates air in the middle latitudes. -Circulation (at 60Â°-90Â°) within a POLAR cell produces polar easterlies, or surface flows that move toward the equator.Trade winds meet at the equator, in a region with a weak pressure gradient, called the doldrums. -FERREL cell circulates air in the middle latitudes. -Circulation (at 60Â°-90Â°) within a POLAR cell produces polar easterlies, or surface flows that move toward the equator.
By means of a countercurrent multiplier system, which utilizes electrolyte pumps, the loop of Henle creates an area of high urea concentration deep in the medulla, near the papillary duct in the collecting duct system.s well, blood in the vasa recta still has large proteins and ions which were not filtered through the glomerulus. This provides an oncotic pressure for ions to enter the vasa recta from the interstitium. The main function of the loop of Henle is to set up a concentration gradient.