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Human Reproduction

Question
CBSEENBI12002333
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Signals for parturition originate from

  • both placenta as well as fully developed foetus

  • oxytocin released from maternal pituitary

  • placenta only

  • fully developed foetus only

Solution

B.

oxytocin released from maternal pituitary

The process of delivery of the foetus (childbirth) is called parturition which 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 maternal pituitary. Oxytocin causes stronger uterine contractions which in turn stimulate further secretion of oxytocin. The stimulatory reflex between the uterine contraction and oxytocin secretion continues resulting in stronger and stronger contractions. This leads to expulsion of the baby out of the uterus through the birth canal i.e., parturition. 

Some More Questions From Human Reproduction Chapter

Which of the following shows hermaphroditism and self fertilization ?

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Sertoli cells provide :

The middle piece of human sperm contains :

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Polar bodies are produced during the process :

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How many spermatozoa or sperms are present in human ejaculate ?

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