Fetal And Post Natal Circulation Flashcards
Where does oxygenated blood enter from and through?
Oxygenated blood from the placenta enters the foetus though the umbilical vein
What does most of the newly oxygenated blood do?
Most of the newly oxygenated blood bypasses the liver via the ductus venosus and combines with DEOXYGENATED BLOOD in the inferior vena cava
Where does deoxygenated blood from the inferior vena Cava go?
Into the right atrium
Where will the blood move through and into and why?
Since pressure in the right atrium is larger than the presses in the left atrium, most blood will be shunted through the foramen ovale
Some blood does travel from the right atrium to the left atrium via…..
The pulmonary trunk
Where does most blood move and via?
Most blood moves directly to the aorta via the DUCTOS ARTERIOSUS
Deoxygenated blood returns to the placenta via…
the UMBILICAL ARTERIES originating from the internal iliacs near the bladder
What happens to the pulmonary vessels in the first breath?
increased alveolar O2 pressure causes vasodilation in the pulmonary vessels
What does the umbilical vein turn into?
Ligamentum teres
What does the umbilical arteries become?
Medial umbilical ligaments
Within 10-15 hours after birth, what does the ductus arteriosis become?
Ligamentum arteriosus
What causes the foreman ovale to change and why?
Increased left atrial pressure and decreased right atrial pressure causes the FORAMEN OVALE to close and become the FOSSA OVALIS
What does the ductus venosus become?
Ligamentum venosus
