[Problem of so-called vascular valves in the umbilical cord and placenta].
D002319:Cardiovascular System; D005260:Female; D005312:Fetal Blood; D006801:Humans; D010920:Placenta / Q000098:blood supply*; D011247:Pregnancy; D014470:Umbilical Cord / Q000098:blood supply*
PLACENTA/blood supply; UMBILICAL CORD/blood supply
K problému t. zv. chlopní cévách pupecníku a placenty.