46. What is the difference
between double closed
circulation and simple closed
circulation?

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Double closed circulation, closed
circulation, is in which the
circulates through two and
parallel vascular : one that
carries to and takes from
the peripheral (the systemic
circulation) the other that
blood to and blood from the
that perform gas with
the environment, .g, the lungs
(pulmonary ). Double
circulation occurs amphibians,

Simple closed , or simple
circulation, the one in the
tissues that gas exchange are
in series with systemic
circulation, as fish.