Starling equation

What are the 4 Starling forces?

The four Starlings forces are: hydrostatic pressure in the capillary (Pc) hydrostatic pressure in the interstitium (Pi) oncotic pressure in the capillary (pc )

How do the Starling forces affect filtration or reabsorption?

For most capillary beds the direction of starling forces reverses as blood moves through the capillary bed. Near the arteriolar side of the microcirculation, starling forces result in outward fluid filtration whereas toward the venous side of the microcirculation starling forces result in fluid resorption.

What increases capillary filtration rate?

Mechanisms of enhanced transcapillary filtration in response to elevations in arterial or venous pressure. Elevations in arterial (Pa) or venous (Pv) pressure increase capillary pressure, which favors enhanced capillary filtration (Jv).

Which Starling forces favor filtration?


Term Arterial Blood PressureDefinition Blood pressure in the aorta
Term Which starling forces favor filtration?Definition Capillary hydrostatic pressure and interstitial fluid osmotic pressure
Term FiltrationDefinition Fluid moves from blood to interstitial fluid

What is Net filtration pressure?

The net filtration pressure (NFP) represents the interaction of the hydrostatic and osmotic pressures, driving fluid out of the capillary. It is equal to the difference between the CHP and the BCOP. Because the BCOP remains steady at 25 mm Hg, water is drawn into the capillary, that is, reabsorption occurs.

What is the difference between hydrostatic and osmotic pressure?

Whereas hydrostatic pressure forces fluid out of the capillary, osmotic pressure draws fluid back in. Osmotic pressure is determined by osmotic concentration gradients, that is, the difference in the solute-to-water concentrations in the blood and tissue fluid.

What is filtration pressure?

net filtration pressure (NFP): pressure of fluid across the glomerulus; calculated by taking the hydrostatic pressure of the capillary and subtracting the colloid osmotic pressure of the blood and the hydrostatic pressure of Bowman’s capsule.

What is glomerular hydrostatic pressure?

The hydrostatic pressure in the glomerular capillaries is essentially the blood pressure in the glomerulus. All else being equal, as the blood pressure increases, the glomerular filtration rate increases, and hence, the amount of filtrate, including water and solutes, entering the Bowman’s capsule increases as well.

What is the formula for net filtration pressure?

Or: NFP = 55 – [15 + 30] = 10 mm Hg (Figure 25.4. 1). Figure 25.4. 1 – Net Filtration Pressure: The NFP is the sum of osmotic and hydrostatic pressures.

What promotes edema?

Causes of Edema Edema may be caused by: Increased capillary hydrostatic pressure (as occurs when venous pressures become elevated by gravitational forces, volume expanded states, in heart failure or with venous obstruction) Decreased plasma oncotic pressure (as occurs with hypoproteinemia)

What are the four causes of edema?

Several diseases and conditions may cause edema, including:Congestive heart failure. Cirrhosis. Kidney disease. Kidney damage. Weakness or damage to veins in your legs. Inadequate lymphatic system. Severe, long-term protein deficiency.

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What does Oncotic mean?

colloid osmotic pressure

What forces favor capillary filtration what forces favor reabsorption?

What forces favor reabsorption? Capillary filtration is the movement of fluid inside the blood vessel to the surrounding tissue. The primary factor promoting capillary filtration is hydrostatic pressure, or the force of liquid against the interior of the blood vessel.

What is the driving force of filtration?

hydrostatic pressure: The pushing force exerted by the pressure in a blood vessel. It is the primary force that drives glomerular filtration.

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