TBR physics chapter 7 question 14 (fluid dynamics and blood flow)

[tdod]

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Why does it say blood volume is constant? Isn't there a net loss of fluid as blood traverses the capillaries?

 

[MedHopeful20134]

By net loss, they mean loss due to hemorrhage or the like. Otherwise, blood volume is constant in the body.
This question is regarding Poiseuille's equation (A1V1 = A2V2 = constant).