The faculty member teaching a class of students explains several theories regarding the onset of labor. Which of the following does the faculty member include? (Select all that apply.)
A.
Closure of ductus arteriosus
B.
Molding of the fetal head
C.
Placental aging
D.
Pressure on the cervix
E.
Uterine muscle stretching
ANS: C, D, E
Several theories regarding the onset of labor exist and include (among others) placental aging,
pressure on the cervix, and uterine muscle stretching.
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