Glomerular filtration occurs because glomerular oncotic pressure overrides glomerular blood pressure.

Question

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Glomerular filtration occurs because of the pressure gradient that exists across the glomerular capillaries. The glomerular blood pressure is the force that drives the filtration, while the glomerular oncotic (or colloid osmotic) pressure opposes it. Therefore, the glomerular blood pressure must be higher than the glomerular oncotic pressure for filtration to occur.

Glomerular Filtration Occurs Because Glomerular Oncotic Pressure Overrides Glomerular Blood