00:01 Forces that promote the filtrate formation include three different forces. 00:06 First, we have the hydrostatic pressure that's found in the glomerular capillaries. 00:12 This is essentially the glomerular blood pressure. 00:17 This is the chief force that is pushing the water and solute out of the blood into the glomerulus. 00:24 The pressure is actually quite high at 55 millimeters of mercury. 00:30 This is compared to the lower 26 millimeters of mercury that you seen in most other capillary beds in the body. 00:39 The reason why the hydrostatic pressure is so high is because the efferent arteriole has a high resistance with a smaller diameter than the afferent arteriole. 00:52 This causes the plasma to pull in the glomerular capillaries, which increases the hydrostatic pressure. 01:01 While hydrostatic pressure is higher than normal and are glomerular capillaries to other pressures caused fluid to remain in the capillaries and not filter out. 01:14 These include the hydrostatic pressure and the glomerular capsule. 01:20 The filtrate pressure and this capsule is 15 millimeters of mercury. 01:25 And this pressure is going to push back up against the glomerular capillaries. 01:32 The third pressure is our colloid osmotic pressure or the pull from most proteins that remain in the blood. 01:42 The colloid osmotic pressure is 30 millimeters of mercury. 01:48 So if we put all of them together, we get our net filtration pressure. 01:55 So this is going to include our 55 millimeter mercury forcing out from our hydrostatic pressure of the glomerular capillaries - the 45 millimeters of mercury opposing or pushing in from our colloid osmotic pressure and our hydrostatic pressure of the glomerular capsule. 02:19 This pressure or the net filtration pressure is going to be responsible for the formation of our field trip. 02:28 And this is the main controllable factor that determines our glomerular filtration rate or GFR.
The lecture Net Filtration Pressure (NFP) – Urine Formation (Nursing) by Jasmine Clark, PhD is from the course Urinary System – Physiology (Nursing).
Which types of pressures are responsible for net filtration pressure (NFP)? Select all that apply.
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