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Flashcards in final chp 13 cardio Deck (35)
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1

when does the cardiovascular system develop?

3rd week
-grow rapidly for nutrition requirements

2

what are the four angioblasts?

-splanchnic mesoderm
-mesenchyme of the yolk sac
-mesenchyme of the umbilical cord
-mesoderm of the chorion

3

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

4

during the 3rd week main blood vessels develop the paired longitudinal vessels become the?

dorsal aorta
anteriorly- aortic arches
posteriorly- heart primordia

5

what do the second set of longitudinal blood vessels become during the 3rd week?

vitelline and umbilical veins

6

what do the vitelline veins do?

returns blood from yolk sac

7

what do the umbilical veins do?

brings blood from the chorion (placenta)

8

what do the cardinal veins do?

returns blood from body

9

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

10

what give sthe heart its shape?

the bubus and ventricle grow faster then the rest of the heart

11

what starts at the lower end of the heart?

the atrium, the growth moves it to the upper portion

12

when does simple ebb and flow type of circulation begin?

22nd day
myogenic origin

13

when does the heart have a unidirectional blood flow with contractions of the heart tube?

28-30 days

14

what is the septum primum?

sickle-shaped crest roof of atrium

15

what is the ostium primum?

opening between septum primum and endocardial cushion

16

what is the ostium secundum?

opening in the septum primum

17

during the 5th week the septum secundum appears, what is it?

right atrium incorporates part of the sinus , a new septum appears

18

what is the oval foramen?

opening in the septum secundam

19

what is the interatrial shunt?

before birth blood enters the right atrium from inferior vena cava to left atrium

20

what percentage of the population doe sthe septum primum and septum secundam fuse?

75%

21

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

22

during the 5th week what forms in the walls of the truncus and bulbas?

ridges form in a spiral

23

what is formed when the truncas and bulbas fuse?

spiral septum-aorticpulmonary septum

24

the aorticpulmonary septum separates what?

the two channels?

25

where does the cavum aorticum open into?

left ventricle

26

where does the cavum pulmonare open into?

right ventricle

27

the two cava separate what?

ascending aorta and pulmonary trunk

28

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

29

when affected with dextracardia, where is the heart located?

in the right hemithorax
-can occur alone though usually associated with other anomalies

30

dextracardia with complete?

situs inversus