Cardiovascular System
If the hydrostatic blood pressure at one point within a capillary is 35 mmHg while the colloid osmotic pressure of blood is 26 mmHg, what is the value of the pressure moving fluid into or out of the vessel? (a positive value indicates fluid movement out of the vessel, while a negative value indicates movement into the vessel).
35 + 26 = 61 mmHg and fluid moves from blood to the interstitial fluid
35 โ 26 = 9 mmHg and fluid moves from blood to the interstitial fluid
26 โ 35 = โ9 mmHg and fluid moves from the interstitial fluid into blood
โ26 โ 35 = โ61 mmHg and fluid moves from the interstitial fluid into blood
35 โ 26 = 9 mmHg and fluid moves from blood to the interstitial fluid
Hydrostatic blood pressure is an influence that moves fluid out of a capillary (so is +ve), while colloid osmotic pressure is an influence that moves water into the capillary (so is โve). Hence +35โ26 = 9.
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