Cardio Flashcards
When does the cardiovascular system develop?
By the end of the 3rd week
What is the development of new blood vessels?
Angiogenesis
What cells are responsible for angiogenesis
Angioblasts
Angioblasts develop from….
1) Splanchnic Mesoderm
2) Mesenchyme of Yolk Sac
3) Mesenchyme of Umbilical Cord
4) Mesoderm of the Chorion
When do the paired vessel begin to form?
the 3rd week
What is the first pair of logitudinal vessels?
Dorsal Aorta
What are the two aspects of the dorseal aorta?
Aortic Arches, Heart Primordia
What is the function of the vitelline veins?
return blood from the yolk sac
What is the function of the umbilical veins?
Bring blood from the chorion (placenta)
what is the function of the cardinal veins
return blood from the body
what from to evetntually form the heart tube
the two thin walled endothelial heart tubes
T/F: The bulbus and ventricles form faster than the rest of the heart?
True
What is the shape of the developing heart?
“S” shaped
T/F: The atreum start growing at the bottom portion of the heart?
True. The heart will then flip and finish growing at the final anatomical area
The area of the developing heart that receives the umbilical, vitelline and common cardinal veins
The Sinus
After the hear tube is developed, it elongates and develops dialations and sacculatons to become what four areas?
1) Truncus Bulbus (cont. w/ aortic arches
2) Ventricle
3) Atrium
4) Sinus
Two acheive the chambers, what two types of tissue formations
1) Tissue Growth
2) Tissue Overgrowth
Which type of growth involves two tissues approaching each other on the same plane
Tissue Growth
What structure of the heart is formed via tissue growth
The Septum
Waht is the atrial septum that is sickle shaped and forms the roof of the atrium
Septum Primum
What is the opening between the septum primum and the endocardial cushion
Ostium Primum
What is the opening in the septum primum
Ostium Secundum
What is the opening in the wall separating the left and right artia and is needed for communication between the two atria
The Foramen Ovale
the internal shunt is responsible for what?
Allows the blood to bypass the lungs
T/F: Prenatal closure of the inter-atrial shunt is compatible with life with some deficit
False. A premature closure of the inter-atrial shunt is not compatible with life at all
What is the condition what effects abotu 25% of the population what the septum primum and secundum do not fuse
Probe Patency of the Oval Foramen
At what day does the normal “ebb and flow” circulation begin?
22nd day
When does the heart have a unidirectional flow of blood with the contraction of the heart tube?
about the 28th-30th days
Oxygenated blood enters the fetus from the placenta via…
Veins
Deoxygenated blood leaves the fetus via…
Arteries
The structure that shunts the fetal pulmonary trunk and diverts blood back to eh aorta
Ductus Arteriosus
The structure in the fetal heart that allows the oxygenated blood to bypass the fetal liver and be shunted to the vena cava…
Ductus Venosus
What two structures fuse to form the Aoritcopulmonary septum
Truncus and Bulbus
The structure that opens into the left ventricle
Cavum Aorticum
The structure that opens into the right ventricle
Cavum Pulmonare
