The sloth's shoulder heart looks resigned about it.
Five minutes before this chart went to print, someone had to decide where the eel's fin ends and its supplemental heart begins, a small compositional problem visible in the faint outline work. The fetal sequence in the lower left runs left to right like a filmstrip nobody asked to see twice. Somewhere in a filing cabinet there is presumably a Chart No. 41, and it is reasonable to assume it was less anatomically ambitious than this one.
anatomical-diagramcalmcardiac-physiologycolorcomparative-anatomydual-circulation-systemeditorialillustrationmedical-educationpeoplesupplemental-hearttext
Aug 2, 2026
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