Glomerular ultrafiltration. Definition

Medical Definition: glomerular ultrafiltration

Process of moving liquid (virtually no protein) through the glomerular capillary. The capillary can be traversed by neutral molecules with molecular radius of less than 20 amstroms (which are filtered freely), but not by those who are above 50 amstroms. It is governed by Starling's law, in which the key factor is the gradient of the transcapillary hydraulic pressure. Nephrons can be studied in isolated using various techniques. In this control involves various hormones and vasoactive substances, both vasodilator and vasoconstrictor.

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