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STD 12 - 2. human reproduction — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 2. human reproduction1 Mark
MCQ
Which one of the following is not the function of placenta?
  • A
    Facilitates removal of carbon dioxide and waste material from embryo
  • ✓
    Secretes oxytocin during parturition
  • C
    Facilitates supply of oxygen and nutrients to embryo
  • D
    Secretes estrogen
✓

Answer

Correct option: B.
Secretes oxytocin during parturition
b
(b) : Parturition is induced by a complex neuroendocrine mechanism. The signals for parturition originate from the fully developed foetus and the placenta which induce mild uterine contractions called foetal ejection reflex. This triggers release of oxytocin from the maternal pituitary. Oxytocin acts on the uterine muscle and causes stronger uterine contractions, which in turn stimulates further secretion of oxytocin. The stimulatory reflex between the uterine contraction and oxytocin secretion continues resulting in stronger and stronger contractions. This lead to expulsion of the baby out of the uterus through the birth canal.

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