What is the function of the hepatic portal circulation? In what way is a portal circulation a “strange” circulation? In a fetus, the liver and lungs are almost entirely bypassed by blood. Why is this?...

What is the function of the hepatic portal circulation? In what way is a portal circulation a “strange” circulation?

In a fetus, the liver and lungs are almost entirely bypassed by blood. Why is this? Name the vessel that bypasses the liver. Name two lung bypasses. Three vessels travel in the umbilical cord; which of these carries oxygen- and nutrient-rich blood?