From what I have read regarding blood pressure and blood flow, I've come to the conclusion that, apart from the osmolarity of blood, the only determinant of how much oxygen/nutrients the tissues get per unit time, is blood flow.

Does blood pressure (not systemic, but within a theoretical capillary) have absolutely no effect on this, and if so, why? Intuitively, it seems to me that if the force by blood on the walls of a capillary increases, that would imply a higher number of molecules touching endothelial cells, and thus a higher likelihood of molecule transport per unit time.

Or is it perhaps that they both have positive effects on oxygenation/nutrient transport; but blood flow's effect greatly excels that of blood pressure?


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