54. Concerning the mixture of
arterial with venous blood
what is the difference
between the human fetal
circulation and the adult
circulation?

Gap-fill exercise

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In the human circulation there are
communications between arterial
venous blood characterizing
incomplete circulation. One them is
the foramen, an opening
the right and left atria of fetal
heart. The is the arterial , a
short vessel the pulmonary
artery the aorta. These
close a few after
birth and they are not in the
adult .