Anatomy II - capillary dynamics

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6 Terms

1
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Hydrostatic pressure (HPc )

Capillary blood pressure. It is a non-pulsatile force that physically pushes water OUT of the bloodstream into the tissues

2
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Osmotic pressure (OPc )

Protein suction force. Created by a concentration gradient that stays constant across the entire capillary bed to draw water in

3
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Net filtration pressure (NFP) formula

NFP = HPc - OPc this dictates whether fluid moves out or moves back into the blood

4
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NFP at the arterial end (positive)

Fluid is pushed out in tissues

5
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NFP at the venous end (negative)

Fluid is drawn back in to blood capillaries

6
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Blood pressure capillary chain

BP = HPc — NFP — volume of fluid pushed out (interstitial fluid) — volume returned to blood (rate of return)