Flashcards in final chp 13 cardio Deck (35)
when does the cardiovascular system develop?
-grow rapidly for nutrition requirements
what are the four angioblasts?
-mesenchyme of the yolk sac
-mesenchyme of the umbilical cord
-mesoderm of the chorion
what are some of the location for the formation of blood cells?
yolk sac 4th week
body and mesenchyme and blood vessel 5th week
liver 6th week
spleen, thymus and lymph 2-3 months
bone marrow 4th month
during the 3rd week main blood vessels develop the paired longitudinal vessels become the?
anteriorly- aortic arches
posteriorly- heart primordia
what do the second set of longitudinal blood vessels become during the 3rd week?
vitelline and umbilical veins
what do the vitelline veins do?
returns blood from yolk sac
what do the umbilical veins do?
brings blood from the chorion (placenta)
what do the cardinal veins do?
returns blood from body
what are the two thin walled endothelial tubes, that are a continuation of the first aortic arches, and eventually fuses to form a single tube?
endocardial heart tubes
what give sthe heart its shape?
the bubus and ventricle grow faster then the rest of the heart
what starts at the lower end of the heart?
the atrium, the growth moves it to the upper portion
when does simple ebb and flow type of circulation begin?
when does the heart have a unidirectional blood flow with contractions of the heart tube?
what is the septum primum?
sickle-shaped crest roof of atrium
what is the ostium primum?
opening between septum primum and endocardial cushion
what is the ostium secundum?
opening in the septum primum
during the 5th week the septum secundum appears, what is it?
right atrium incorporates part of the sinus , a new septum appears
what is the oval foramen?
opening in the septum secundam
what is the interatrial shunt?
before birth blood enters the right atrium from inferior vena cava to left atrium
what percentage of the population doe sthe septum primum and septum secundam fuse?
in the 25% of the population that the septum primum and septum secundam does not fuse, what happens?
probe patency of the oval foramen occurs
during the 5th week what forms in the walls of the truncus and bulbas?
ridges form in a spiral
what is formed when the truncas and bulbas fuse?
spiral septum-aorticpulmonary septum
the aorticpulmonary septum separates what?
the two channels?
where does the cavum aorticum open into?
where does the cavum pulmonare open into?
the two cava separate what?
ascending aorta and pulmonary trunk
where is the heart located in those affected with ectopic cordis?
either in the neck or through a diaphragmatic hernia
-limited life expectancy without surgery
when affected with dextracardia, where is the heart located?
in the right hemithorax
-can occur alone though usually associated with other anomalies