PHGY 209 Lecture 2: PHGY 209 - Blood, Lecture 2
11 Oct 2017
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Document Summary
What happens with these forces physiologically and in pathological situations. Starling forces do not apply to the distribution of nutrients, gases and wates across the capillary wall. They only determine the distribution of ecf volume between the plasma and the isf. Blood is pushed through arteries and veins until they reach a capillary. As the blood is pumped by the hearth, By the time the blood reaches the capillary the pressure decreases to 35mmhg (contraction) When the blood is at the end of the capillaries the pressure is at 15 mmhg (contraction) If these were the only pressure, we would lose fluid to the isf very quickly. Opposing force prevents loos of fluids from the plasma. This is the c. o. p which exerts a force of 25mmhg, preventing fluids from leaving the capillaries walls. 35-25 = 10mmhg pushing things out of the capillaries at the entry of those.
