<prompt> All are true about uteroplacental circulation except -Blood in the intervillous space is completely replaced 3-4 times per minuteThe villi depend on the maternal blood for their nutritionA mature placenta has 150 ml of blood in the villi system and 350 ml of blood in the intervillous spaceIntervillous blood flow at term is 500 - 600 ml per minute  <response>: Ans. is c i.e., A mature placenta has 150 ml of blood in the villi system and 350 ml of blood in the intervillous space Uteroplacental Circulationo A mature placenta has a volume of about 500 ml of blood; 350 ml being occupied in the villi system and 150 ml lying in the intervillous space.o Intervillous blood flow at term is around 500 - 600 ml per minuteo The blood in the intervilllous space is completely replaced about 3-4 times per minute.o The villi depend on maternal circulation for nutrition, thus it is possible for the chorionic villi to survive for a varying period even after the fetus is dead. 