51. Why can the amphibian
circulation be classified as
double and incomplete?

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The amphibian circulation double
because it of systemicand
pulmonary : respectively,
heart-tissues-heart and -lungsheart. Since amphibians have one
ventricle in heart, venous blood
from the tissues arterial
blood coming the lungs are
in the ventricle then pumps the
back to the and to the
circulations.The amphibian
circulation classified as incomplete
venous and arterial mix
in the .

The blood oxygenation amphibians
occurs also the systemic circulation
their skin isa exchange
organ.