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Question
How is Placenta formed? What are its functions?
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Solution
It is formed by the union of uterine endometrial tissue, chorion, and allantois (embryonic tissue). It is attached to the wall of the uterus and through it, the exchange of nutrients, hormones, respiratory gases, and urea occurs between the fetal and maternal circulation.
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RELATED QUESTIONS
Name the following:
The canal through which the testes descend into the scrotum just before birth in human male child.
Differentiate between:
Amnion and allantois
Differentiate
Amnion and Chorion.
Complete the following sentences with appropriate word:
The embryo inside the uterus is protected from jerks or mechanical shocks by ________
Which of the following reproductive structures is responsible for secretion of hCG?
During pregnancy, which hormones are secreted by the placenta?
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 |
How are carbon dioxide and urea, excreted by the foetus, removed?
Write one sentence using the following term pertaining to reproduction in humans.
Placenta
Heart and blood vessels have been formed by the end of five weeks of pregnancy.
