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प्रश्न
What changes occur at the time of birth?
उत्तर
A cycle of uterine contractions followed by labour pains, dilation of the cervix and the vagina slowly pushes the fetus out of the uterus. The uterine contractions are initiated by decreased progesterone secretion and the secretion of oxytocin hormone by the pituitary gland. After the child's delivery, the placenta is expelled out.
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संबंधित प्रश्न
Name the following:
The body part in which the embryo develops.
Given below is the name of certain stage/substance related to reproduction and found in human body. Answer the questions related to it.
Implantation.
- The development stage that undergoes this process.
- The approximate time after fertilisation, when it occurs.
Describe briefly the ways how a mammalian embryo is nourished
Differentiate
Uterus and Urethra.
The diagram given below is that of a developing human foetus in the womb. Study the same and then answer the questions that follow:
- Name the parts '1' to '5' indicated by guidelines.
- What term is given to the period of development of the foetus in the womb?
- How many days does the foetus take to be fully developed?
- Mention two functions of the parts labelled ‘2’ other than its endocrine function.
- Name the hormone (anyone) produced by the part labelled ‘2’.
- What is the function of the part marked ‘3’?
The diagram given below shows an embryo in the uterus of mammal. Label the parts indicated.
Name the Following
The expulsion of the fetus from the body of the mother.
Name the following:
Two hormones secreted from placenta.
Does the foetus inside the mother's uterus breathe?
Mother's blood flows into the foetus through placenta.
