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प्रश्न
Heart and blood vessels have been formed by the end of five weeks of pregnancy.
पर्याय
True
False
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उत्तर
This statement is True.
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संबंधित प्रश्न
What is the significance of amniotic fluid?
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.
Name and describe very briefly, the stages in the development of human embryo.
What is Placenta?
What changes occur at the time of birth?
The diagram given below shows an embryo in the uterus of mammal. Label the parts indicated.
Complete the following sentences with appropriate word:
The period of complete development of the fetus until birth is termed ______.
Match the respiratory surfaces to the organisms in which they are found.
| Organ/ cells | Hormones | ||
| (i) | Corpus luteum | (a) | HCG |
| (ii) | Leydig's cells | (b) | Estrogen |
| (iii) | Placenta | (c) | Progesterone |
| (iv) | Graafian follicle | (d) | Testosterone |
Name the following:
Two hormones secreted from placenta.
List the substances which the foetus receives from the mother through placenta.
