Single circulation, Found in fish, Blood passes through the heart once during one circuit, Body and respiratory organs on the same circuit, Body tissues receive blood at lower pressure, Less efficient, allowing less oxygenation of tissue, Less available oxygen lowers metabolic rates, Double circulation, Found in humans, Blood passes through the heart twice during one circuit, Body and respiratory organs on separate circuits, Body tissues receive blood at higher pressure, More efficient, allowing greater oxygenation of tissues, More available oxygen allows greater metabolic rates

Single and double circulation

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