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CVS 204: Test 3
Terms in this set (59)
the most sensitive period cardiac development is ______ to ______ weeks
3 to 6
the first organ to reach a functional state is the ______
heart (the cardiovascular system)
at what age does the heart begin to beat?
22 days (gestational age)
at ______ days the fetal heart is developed into a complete complex structure
the four chamber develop between the _____ and _____ week
4th and 5th
state the three (3) fetal heart tube layers
1. external myocardial mantel
2. internal layer of endothelial cells
3. cardiac jelly (Whartons jelly)
external myocardial mantel is _____ to _____ cell layers thick
1 to 2
internal layer of endothelial cells is ______ cell layer thick
the cardiac jelly is the middle layer:
what is its purpose?
separates the myocardial mantel layer from the internal layer of endothelial cells
what is the purpose of the three (3) fetal shunts?
to bypass the lungs and liver
when the heart loops ventrally and to the right, it's in what position?
if the heart loops to the left, it's in what position?
the right sinus valve forms what two (2) valves in fetal heart development?
eustachian and thesbian
What does the sinus venosus become?
coronary sinus and IAS
the primitive atrium develops into the _____
left and right atria
the primitive ventricle develops into the _____
the bulbus cordis develops into the ____
the conus develops into the ______
Truncus arteriosus develops into the ____
aorta and pulmonary trunk
what occurs during the 4th and 5th weeks of fetal development?
the division of the four chambers
during the 4th and 5th weeks of fetal development, the 4 chambers divide so that the common atria and ventricles separate into _____ and ____ sides by fusion of ______
left and right
endocardial cushions and AV valves
state the three (3) shunts
1. ductus venosus
2. foramen ovale
3. ductus arteriosus
the ductus venosus becomes the ______
ligamentum venosum of liver
the foramen ovale become the _____ in adults
ductus arteriosus becomes the ______
ligamentum arteriosum after birth
the shunt that bypasses the lungs is called the _____. it moves blood from ____ to ______
right atrium to left atrium
for the aortic arch formation there is ____ pairs of aortic arches
the 3rd pair of arches becomes the origin of the _____
the 6th pair of arches becomes the origin of the _____
name the arches that are absorbed and do not persist
1, 2 and 5
the ______ pair of the aortic arch becomes the _____
becomes aortic arch
the most sensitive period for cardiac development is ____ to ___ weeks
3 to 6
septation occurs between _____ to _____ days
33 to 37 days
state the fetal heart blood circulation
umbilical vein -> ductus venosus -> ivc -> ra -> foramen ovale -> tv -> rv -> pv -> mpa -> lungs -> la -> mv -> lv ->aorta -> ductus arteriosus -> umbilical arteries -> placenta
blood flow in fetal heart: 60% goes to the _____ while 40% goes to the _____
60%: foramen ovale
40%: right ventricle
in the fetal circulation there are ____ umbilical arteries and ____ umbilical veins
the ductus arteriosus closes within ____ to ____ hours after birth
48 to 72
how many nerves are in the umbilical cord?
the ductus venosus closes due to _____
a decrease in blood flow across the vessel
circulation of blood begins at the ____ week
when there is a small ASD/VSD, overtime the shunts may cause volume increases on the right side, causing systemic circulation to be deoxygenated blood.
what is this condition known as?
name the three (3) types of atrial septal defects
1. osteum primum
2. osteum secundum
3. sinus venosus
four (4) types of ventricular septal defects are....?
1. peri membranous
the most common type of ASD defect is.....?
the most common type of VSD defect is.....?
what is the transposition of the great vessels?
when the pulmonary artery arises from the LV and the aorta arises from the RV
what causes the closing of the foramen ovale?
increase in left heart pressure
the coarctation of the aorta is _____
narrowing of the aorta (stenosis)
where does coarctation of the aorta occur?
near origin of the left subclavian artery
Tetrology of Fallot has 4 defects. what are they?
1. large VSD infracristal membranous
2. pulmonary stenosi
3. overriding of the aorta
4. RV hypertrophy
what happens with Ebstein's anomaly? (4)
1. Tricuspid leaflets are displaced apically one or more leaflets
2. RV becomes smaller
3. ARV - atrialized RV
4. FRV - functional RV
during fetal development, blood enters through the _____
caudal end (sinus venosus)
partial endocardial cushion defect include....? (2)
1. Septum primum ASD
2. Cleft mitral valve
Complete endocardial cushion defect include a combination of....?
3. Common atrioventricular valve
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