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प्रश्न
Comment on the role of placenta as an endocrine gland.
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उत्तर
Placenta acts as an endocrine gland and produces the human chorionic gonadotropins, human placental lactogen, oestrogen, progesterone and relaxin (later stages of pregnancy). These hormones support foetal growth and help in the maintenance of pregnancy. Hormones like oestrogen, progestogen, cortisol and prolactin are increased several folds in the maternal blood.
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संबंधित प्रश्न
Arrange the following hormones in sequence of their secretion in a pregnant woman. Mention their source and the function they perform:
hcG, LH, FSH, Relaxin
State the Function of Chorionic Villi
Medically it is advised to all young mothers that breast-feeding is the best for their newborn babies. Do you agree? Give reasons in support of your answer.
Mention any two functions of the human placenta.
Eye lens is formed from ______.
Which of the following statements are correct with respect to hormones secreted by the placenta?
- The placenta secretes relaxin during the later stage of pregnancy.
- The placenta secretes a high amount of FSH during pregnancy.
- The placenta secretes relaxin during the initial stage of pregnancy.
- The placenta secretes hCG and hPL during pregnancy.
Read the following and answer from given below:
Cleavage is the series of rapid mitotic divisions in the zygote and forms blastula. The 2, 4, 8, 16 daughter cells are called blastomeres. An embryo with 64 blastomeres is known as a blastocyst and has a blastocoel cavity. Blastocyst gets implanted in the uterine wall and leads to pregnancy.
The correct sequence of various structures formed during embryonic development is ______
The secondary sexual characters develop in females because:
Except endocrine function, what are the other functions of placenta.
The diagram given below shows the early embryonic stages of fish, reptiles, birds and humans. Though adult reptiles, birds and mammals breathe air, their embryos possess gills. How does this fact support evolution?
