Figure 1.

Blood pressure drop across four models with symmetric large vessels. [a] Zhuang et al.[22] Curves (1 and 2) show pressure drop across two models that statistically match the same morphometric data. Capillary beds join arteries and veins in parallel. [b] Clark et al.[29] Model A (red) joins large vessels similarly to Zhuang et al.; Model B (black) joins arteries and veins via a ladder model for combined series and parallel perfusion of capillary sheets. Figure sources: [a] redrawn from Zhuang et al.;[22] [b] from Clark et al.[29], used with permission.