Heart Tube Looping
Embryology
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Cardiorespiratory System
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Heart
Q. On ~day 23, which of the following is true:
a
The tube approximates a U shape
b
Progenitor cells from the second heart tube begin to elongate and bend the tube
c
The aortic sac arises from the truncus arteriosus
d
The sinus venosus lies dorsally
e
All of the above
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