Biology / Bio 3187 · Atom · ~20 seconds
Single versus Double Circulation
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Single circulation routes blood through the heart once per circuit, as in fish; double circulation routes it through the heart twice, once toward lungs, once toward body.
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A fish's single circuit runs heart to gills to body and back once.
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Double circulation repressurizes blood between lung and body circuits; single circulation cannot repressurize between gill and body delivery.