A) babies' accumulated urine
B) amniotic fluid
C) mother's plasma from the umbilical cord
D) baby's plasma from its foetal circulation
Correct Answer: B
Solution :
During dilation stage of parturition, the uterine contraction starts which pushes baby's head against cervix. Due to this, cervix and vagina get dilated. Dilation of cervix increases the stimulus for oxytocin secretion, which increases the frequency and strength of contractions. With continued powerful contractions, the amnion ruptures and the amniotic fluid flows out through vagina.
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