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Case:
The average duration of human pregnancy is about 9 months. Parturition in humans is induced by a complex neuroendocrine mechanism. Rekha has completed her 9 months of pregnancy and her expected delivery date has passed but she has not undergone labor. Both her and family got worried and went to the hospital to consult her obstetrician. A complete blood work was done and the doctor observed extremely low levels of certain hormones and high levels of hPL, estrogen, thyroxine, etc.
On further examination, the doctor revealed that her uterus is not showing vigorous contractions which are extremely needed for delivery of the foetus. The doctor took consent from Rekha and injected her with a medicine to promote uterine contractions. Also, her obstetrician counselled her about benefits of breast feeding and good practices for postnatal care of herself and the baby.

Where do signals for parturition begin?
[0.7 mark]

A
Placenta only
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B
Fully developed foetus only
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C
Placenta and fully developed foetus
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D
Maternal hypothalamus
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Solution

The correct option is C Placenta and fully developed foetus
The signals for parturition originate from placenta and fully developed foetus which induce mild uterine contractions called foetal ejection reflex.

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