<prompt> Efferent aeriole constriction causesIncreased GFRDecreased GFR IncreasesGFR initially then decreasesDecreased GFR initially then increase  <response>: The efferent aerioles are blood vessels that are pa of the urinary tract of organisms. The efferent aerioles form from a convergence of the capillaries of the glomerulus. They play an impoant role in maintaining the glomerular filtration rate despite fluctuations in blood pressure.Ref: Ganong;s review of medical physiology; 24th edition; page no; 679 