Development of the Cardiovascular System Flashcards
What is the first embryonic system to become functional?
circulatory
When does blood flow begin
by the end of the third week
What do the original heart tubes develop from?
splanchnic mesoderm of the cardiogenic area
When does the heart begin to beat?
22 to 23 days
In the developing circulatory system what do vitelline veins do?
Return poorly oxygenated blood from the umbilical vesicle (yoke sac)
What do umbilical veins do?
Carry well-oxygenated blood from the chorionic sac
What do common cardinal veins do?
return poorly oxygenated blood from the body of the embryo
In the primordial heart what does the arterial system connect to?
truncus arteriosus
In the primordial heart what does the venus system connect to?
sinus venosus
During development the _________ side of the sinus venosus enlarges and there is a shift towards the _____ side for venus return
right
What is the fate of the left region of the sinus venosus?
coronary sinus
What is the fate of the right region of the sinus venosus?
incorporated into the wall of the right atrium
Cardinal veins have an anastomosis between them of subcardinal veins, which gives rise to the ?
Inferior Vena Cava
_______ veins anastomosis and supply blood to the early liver
vitelline
Why is there only one vein in the umbilical cord?
Right umbilical vein disappears and the left is persistent
