2. Fetal circulation is the
way blood is distributed
through the fetus's
circulatory system
during intrauterine life.
All nutrients and oxygen
come from the mother
and reach the fetus
through the placenta
and the umbilical cord.
During the entire
pregnancy, the placenta is
responsible for
oxygenating the blood
and providing nutrients
through the umbilical
cord.
In the umbilical cord
there are three vascular
structures that allow
oxygen circulation:
Two umbilical arteries.
An umbilical vein.
The circulatory system of
the embryo has
characteristics which
allow the circulation of
blood towards the
capillary beds:
The oval hole.
The ductus arteriosus.
The ductus venosus.
1.
2.
3.
4.
5.
Heart rate in the
5th week HR = 65
beats / min to 160
beats / min.
THE LAST
QUARTER OF
PREGNANCY: The
autonomic
nervous system is
already functional.
HR = 140 beats /
min.
