Changes

===Foetal Circulation===

===Foetal Circulation===

Prior to birth the foetus is not capable of respiratory function and thus relies on the maternal circulation to carry out gas, nutrient and waste exchange. The foetal and maternal blood never mix, instead they interface at the [[Gestation -Placenta - Anatomy & Physiology|placenta]]. Consequently the liver and the lungs are non-functioninal, and a series of shunts exist in the foetal circulation so that these organs are almost completely by-passed.   

Prior to birth the foetus is not capable of respiratory function and thus relies on the maternal circulation to carry out gas, nutrient and waste exchange. The foetal and maternal blood never mix, instead they interface at the [[Gestation -Placenta - Anatomy & Physiology|placenta]]. Consequently the liver and the lungs are non-functional, and a series of shunts exist in the foetal circulation so that these organs are almost completely by-passed.   

====Shunt 1: The Ductus Venosus====

====Shunt 1: The Ductus Venosus====