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प्रश्न
Answer the following question.
Which hormones are involved in parturition?
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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
Name the enzyme secreted by the prostate gland.
Identify the parts labelled in the given diagram.
Uterine contraction during parturition are triggered by ____________.
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 |
Write one sentence using the following term pertaining to reproduction in humans.
Gestation
Write one sentence using the following term pertaining to reproduction in humans.
Head first
Write one sentence using the following term pertaining to reproduction in humans.
Tied and cut
Distinguish between the following pair:
Implantation and gestation
Distinguish between the following pair:
Pregnancy and parturition
Find the correct statements:
- In human pregnancy, the major organ systems are formed at the end of 12 weeks.
- In human pregnancy, the major organ systems are formed at the end of 8 weeks.
- In human pregnancy, heart is formed after one month of gestation.
- In human pregnancy, limbs and digits develop by the end of second month.
- In human pregnancy, the appearance of hair usually observed in the fifth month.
Choose the correct answer from the options given below:
