final exam cardiovascular system Flashcards
cardiovascular system develops?
3rd week
angiogenesis is?
development of new blood vessels
angioblasts
stem cells that give rise to blood vessels
paired vessels form longitudinal vessels in which week?
3rd week; 1st pair dorsal aorta
which structure returns blood from the yolk sac?
vitelline veins- deoxygenated
which structure brings blood from the chorion(placenta)?
umbilical veins- oxygenated
which structure returns blood from body?
cardinal veins
describe the process of the development of the heart
2 thin walled endothelial tubes which are a continuation of the 1st aortic arches eventually fuse to form a single tube
what gives the heart an s shape?
the bulbus and ventricle grow faster than the rest of the heart giving it its shape
in order to achieve the heart chambers what are the 2 types of tissue formation?
tissue growth and overgrowth
tissue growth involves 2 or more tissues approaching each other on the same plane
they then fuse together to make 2 chambers- septum
overgrowth of the chamber in the developing ventricle except for narrow strip which does not grow
tissue grows on either side of the strip and walls expand to form septum- overgrowth
what is the sickle shaped crest or roof of atrium
septum primum
what is the opening between septum primum and endocardial cushion?
ostium primum
what is the opening in the septum primum?
ostium secundum
what is the opening in the septum secundum?
oval foramen
before birth blood enters the right atrium from the inferior vena cava to the left atrium
interatrial shunt
probe latency of the oval foramen happens when?
the septum primum and septum secundum don’t fuse- 25% of people
what method is used for developing the ventricle septa?
overgrowth method for ventricle chamber
what are the stages for contraction of the heart?
ebb and flow circulation begins on day 22
28-30 heart has unidirectional blood flow with contractions
describe the circulation of the fetus
oxygenated blood enter fetus from placenta via veins
deoxygenated blood leaves via arteries
shunts in fetal pulmonary trunk that divert blood back to aorta are called?
ductus arteriosus
shunts in fetal heart that cause deoxygenated blood to bypass fetus developing liver to reach vena cava are called?
ductus venous
5th week ridges form in walls of?
truncus and bulbus which fuse to form spiral septum
the septum of the truncus and bulbus separate
cavum aorticum and cavum pulmonare
when heart is located through the sternal fissure either neck or diaphragmatic hernia its called
ectopic cordis- life expectancy limited
when heart is located in the right hemithorax its called
dextra cardia
a small patent foramen ovale or complete absence which creates loud systolic murmur is called
atrial septal defect ADS- can be tolerated into adulthood
harsh systolic murmur- erb’s point
ventricular septal defect VSD- considered harmless, can spontaneously close
describe tetralogy of fallot
1 pulmonary stenosis
2 ventricular septal defect
3 overriding aorta
4 right ventricular hypertrophy