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- Parturition : Symptoms, Stages and Hormones MCQ - Practice Questions with Answers
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17 Questions around this concept.
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EASY In human adult females oxytocin
Signals for parturition originate from:
Which of these is not an important component of initiation of parturition in humans?
The signals for parturition originate from
The event in which vigorous contraction of the uterus at the end of pregnancy cause expulsion/delivery of foetus
Foetal ejection reflex in human female is induced by:
The fetal ejection reflex in human females is induced by
Concepts Covered - 1
Parturition
- The average duration of human pregnancy is about 9 months which is called the gestation period.
- Vigorous contraction of the uterus at the end of pregnancy causes expulsion/delivery of the foetus.
- This process of delivery of the foetus (childbirth) is called parturition.
- The signals for childbirth originate from the fully matured foetus and placenta which induce mild uterine contraction called the foetal ejection reflex.
- This leads to the release of oxytocin from the posterior pituitary gland of the mother.
- Parturition begins with a series of involuntary contractions of the uterus that are experienced as labour pains.
- The contraction of the uterine muscles is increased by oxytocin.
- Relaxin increases the flexibility of the pubic symphysis and dilates the uterine cervix during labour pains.
- This leads to the expulsion of the baby out of the uterus through the birth canal – parturition.
- Soon after the infant is delivered, the placenta is also expelled out of the uterus.
- In about 28-35 days, the uterus returns fully to its nonpregnant state by a reduction in size and restoration of the endometrium of the uterus.
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Parturition
Biology Textbook for Class XII
Page No. : 54
Line : 21
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