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32 Cards in this Set

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  • Back
t/f... the lungs are inflated in the foetus
false
where does the foetus get oxygenated blood from?
the placenta via the umbilical vein
how many umbilical veins are there?
one
where does the oxygenated blood from the umbilical vein travel?
across the right atrium through the foramen ovale to the left atrium
which part of the foetus receives the best oxygenated blood?
the head and upper limbs
how does deoxygenated blood enter the foetal heart?
through the SVC and IVC
where does deoxygenated blood in the foetal right atrium travel?
right ventricle
what is the ductus arteriosus?
connection between pulmonary trunk and aorta in the foetus
what type of blood is supplied to the lower part of the foetus?
both oxygenated and deoxygenated blood
when does heart development begin in the embryo?
about 3 weeks gestation
t/f... the heart starts beating at 3 weeks gestation
true
what divides the left and right atrioventricular canals?
the two endocardial cushions which grow from the posterior and anterior walls of the heart and fuse together
what grows first, the muscular part of the interventricular septum or the membranous part?
muscular part
at what stage of gestation are the ventricles completely separated?
7 weeks
what is the name of the hole in the septum primum?
foramen primum
what is the foramen primum replaced by?
foramen secundum
on which side of the primary septum does the septum secundum grow?
the right side
defects of the cardiovascular system occur at a rate of about .../1000?
8
what is the most common heart defect?
VSD
t/f... at birth, the pressure in the right side of the heart is roughly the same as in the left side
true
after birth, the pressure in the right side of the heart will...?
decrease to about 1/3 of the pressure in the left side
what type of shunt occurs with a ventricular septal defect?
left-to-right
how long does a baby with a ventricular septal defect take to develop congestive heart failure?
2-4 weeks after birth
t/f... a small defect will produce more noise on auscultation than a larger one
true
what are the four problems present in tetralogy of fallot?
pulmonary stenosis, VSD, overriding aorta, right ventricular hypertrophy
VSDs in which part of the interventricular septum more often close spontaneously?
muscular
is a baby likely to be cyanosed if they have the tetralogy of fallot?
yes
how common is tetralogy of fallot? (%)
0.03%
what is the frequency of atrial septal defects?
0.1%
what type of shunt will develop with a patent ductus arteriosus?
left - right shunt
what is the result of an untreated ventricular septal defect?
pulmonary vessels become resistant to stretch, right ventricle hypertrophies and pressure in right side of heart rises above pressure in left side and the shunt reverses from left-to-right to right-to-left.
what does the ductus arteriosus become eventually after birth?
ligamentum arteriosum