Starlings 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.

How do you calculate capillary hydrostatic pressure?

Capillary Hydrostatic Pressure (PC ) The average capillary hydrostatic pressure is determined by arterial and venous pressures (PA and PV), and by the ratio of post-to-precapillary resistances (RV/RA).

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).

What is colloidal pressure?

Oncotic pressure, or colloid osmotic pressure, is a form of osmotic pressure induced by proteins, notably albumin, in a blood vessel’s plasma (blood/liquid) that displaces water molecules, thus creating a relative water molecule deficit with water molecules moving back into the circulatory system within the lower

What is Net filtration?

The net filtration pressure (NFP) represents the interaction of the hydrostatic and osmotic pressures, driving fluid out of the capillary. Since filtration is, by definition, the movement of fluid out of the capillary, when reabsorption is occurring, the NFP is a negative number.

Which Starling forces favor filtration?


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

What would happen if the capsular hydrostatic pressure?

What would happen if the capsular hydrostatic pressure were increased above normal? Net filtration would increase above normal. Filtration would increase in proportion to the increase in capsular pressure. Capsular osmotic pressure would compensate so that their filtration would not change.

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 increases hydrostatic pressure?

An increase in small artery, arteriolar, or venous pressure will increase the capillary hydrostatic pressure favoring filtration. A reduction of these pressures will have the opposite effect. Tissue pressure can change significantly if fluid moves into tissue space.

What is the equation 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 does Oncotic mean?

colloid osmotic pressure

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.

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)

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