The second major difference is the presence in fetal pigs of an opening between the heart atria (through the interatrial septum), called the foramen ovale. The ductus venosus leads in turn to the caudal vena cava, through which the blood enters the right atrium. First, as you have already learned, oxygenated blood that is high in nutrients obtained from the placenta enters the fetal pig body not from lung capillaries, but via the umbilical vein to the ductus venosus in the liver. There are three major differences between normal circulatory pathways and fetal circulation. What is the presence of the round ligament in the fetal pig? It isnottt Share to. In Humans, the bladder is a pear shaped sac located just above and behind the pubic bone. The structure is a round cartilaginous barrier. The round ligament is a structure present in the urogenital systemof fetal pigs.
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