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प्रश्न
What changes occur at the time of birth?
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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.
संबंधित प्रश्न
Name the following:
The body part in which the embryo develops.
Give appropriate terms for the following:
Rupture of follicle and release of ovum from the ovary.
Given below is the name of certain stage/substance related to reproduction and found in human body. Answer the questions related to it.
Placenta
- What are the two sources that form placenta?
- Name any two main substances which pass from foetus to mother through placenta.
- Name any two hormones it produces.
Differentiate between:
Follicle and corpus luteum
The circulatory system of the fetus and that of the mother are never connected directly. What are the advantages?
Name the Following
A hollow pear-shaped muscular organ that holds, nourishes and protects the fetus.
Complete the following sentences with appropriate word:
The placenta is ________permeable
Name the following:
Two hormones secreted from placenta.
Given below is the name of certain stage/substance related to reproduction and found in human body. Answer the questions related to it.
Morula.
- What is this stage?
- Name the stage which comes next to it?
The average gestation period from conception to parturition is approximately how many days?
