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Glomerular Filtration Pressure

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Glomerular Filtration Rate, GFR, is the amount of plasma that is filtered in a minute; this filtration occurs because of the pressures in the afferent and efferent arterioles of the glomerulus. GFR can be affected by the net filtration pressure (NFP); furthermore, GFR can be affected by the sympathetic nervous system. NFP is the pressure that drives filtrate through the glomerulus; it is calculated by taking the difference of outward and inward pressures. If the pressure is increased and more filtrate is going through the glomerulus, GFR increases thus increasing urine output. If NFP decreases, less filtrate is going through the glomerulus, so GFR and urine output is decreased.

In the event that fluid is lost (dehydration, blood loss etc.),

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