Foramen Ovale (#1) Opening in septum between Right & Left atria Allows blood to by-pass the lungs Approximately 50% of blood volume passes through this shunt
	Ductus Arteriosus (#2) Passage situated between the Pulmonary Artery (PA)  & Aorta In fetal days, blood leaves the PA & enters the aorta: we refer to this as a RIGHT to LEFT shunt Again, allows blood to by-pass the lungs Approximately 30% of blood volume passes through this shunt If perpetuated after birth we will know it as the Patent Ductus Arteriosus (PDA)
	Ductus Venosus (#3) Opening located on the underside of the liver in the Portal System Allows the umbilical vessels access to and from the placenta