In human beings,at the end of $12$ weeks (first trimester) of pregnancy,which of the following is observed?
- AMovement of the foetus
- BEyelids and eyelashes are formed
- CMost of the major organ systems are formed
- DThe head is covered with fine hair
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What is the correct sequence of development?
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View SolutionPlacenta acts as an endocrine tissue and produces several hormones like:
$A.$ Human chorionic gonadotropin $(hCG)$
$B.$ Human placental lactogen $(hPL)$
$C.$ Estrogens
$D.$ Progesterone
$A.$ Human chorionic gonadotropin $(hCG)$
$B.$ Human placental lactogen $(hPL)$
$C.$ Estrogens
$D.$ Progesterone
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View SolutionThe three germ layers—ectoderm,endoderm,and mesoderm—are formed by the division of the embryo. Identify the error in the given statement regarding the process of organogenesis mediated by stem cells.
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View SolutionThe eutherian placenta is derived from,or in mammals,the placenta is formed by:
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View SolutionSome hormones like $hCG$,$hPL$,estrogens,and progestogens are produced by which of the following?
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