Watergate was a major political scandal that occurred in the United States in the 1970s, following a break-in at the Democratic National Committee headquarters at the Watergate office complex in Washington, D.C. in 1972 and President Richard Nixon's administration's attempted cover-up of its involvement.
The main driving force causing glomerular filtration is: A. osmotic pressure of plasma colloids promoting filtration.
The afferent arteriole is in red, and the efferent arteriole in blue. The glomerular filtration rate (GFR) depends on the pressure difference between the two, which affects the hydrostatic pressure at the glomerulus. Also, note that vasodilation has the opposite effect of vasoconstriction on GFR. (For a nice image and explanation, look at Figure 6 here) So: 1  Constriction of the afferent arteriole decreases the blood flow into the glomerulus and thus the glomerular hydrostatic pressure, which leads to a decrease in GFR. In contrast, constriction of the efferent arteriole decreases blood flow out of the glomerulus, and this increases the glomerular hydrostatic pressure and leads to an increase in GFR.