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Some systems are in parallel so let's just call those like $R_{\text{lungs}}$.

I got this formula


where $R_c$ capillaries, $R_a$ arterioles, $R_A$ Small artery, $R_v$ venules and $R_V$ vein.

However, I am not convinced that we can so explicitly state the total resistance of the systemic circulation.

Is there any more appropriate way to define systemic circulation?

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