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प्रश्न
Answer the following question.
Which hormones are involved in parturition?
उत्तर
Parturition is controlled by a complex neuroendocrine mechanism.
1. Signals arise from the fully formed foetus and placenta cause mild uterine contractions.
2. This is accompanied by rise in estrogen- progesterone ratio, increase in oxytocin receptors in uterine muscles.
3. Increase in hormone ratio causes vigorous contractions of myometrium of uterus at the end of pregnancy.
4. The fully developed foetus gives signals for the uterine contractions by secreting Adrenocorticotropic Hormone (ACTH) from pituitary and corticosteroid from adrenal gland.
5. This, in turn, triggers the release of oxytocin from mother’s pituitary gland, which acts on the uterine muscles of the mother and causes vigorous uterine contractions leading to the expulsion of the baby from the uterus.
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संबंधित प्रश्न
What do you mean by identical and fraternal twins?
Explain the process of parturition.
ACTH is ____________.
Identify the INCORRECT match.
In human female, during which state of parturition does amnion and chorion rupture?
Column I contains terms and Column II contains definitions. Match them correctly and choose the right answer.
| Column I | Column II |
| A. Parturition | 1. Attachment of zygote to the endometrium |
| B. Gestation | 2. Release of the egg from the Graafian follicle |
| C. Ovulation | 3. Delivery of baby from the uterus |
| D. Implantation | 4. Duration between pregnancy and birth |
| E. Conception | 5. Formation of a zygote by fusion of the egg and sperm. |
| 6. Stoppage of ovulation and menstruation |
Name the three stages of parturition.
Write one sentence using the following term pertaining to reproduction in humans.
After-birth
Write one sentence using the following term pertaining to reproduction in humans.
Tied and cut
Distinguish between the following pair:
Implantation and gestation
