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Net Filtration Pressure (NFP) – Urine Formation (Nursing)

by Jasmine Clark

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    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.


    About the Lecture

    The lecture Net Filtration Pressure (NFP) – Urine Formation (Nursing) by Jasmine Clark is from the course Urinary System – Physiology (Nursing).


    Included Quiz Questions

    1. Hydrostatic pressure in the glomerular capillaries
    2. Hydrostatic pressure in the glomerular capsule
    3. Colloid osmotic pressure in the capillaries
    4. Colloid osmotic pressure in the glomerular capsule
    5. Colloid osmotic pressure in the podocytes

    Author of lecture Net Filtration Pressure (NFP) – Urine Formation (Nursing)

     Jasmine Clark

    Jasmine Clark


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