In which of the following the placenta forms an important structure in development
Amphibian
Reptiles
Birds
Mammals
It's Obvious
Which of the following hormones is not a secretory product of human placenta?
Placenta is the region, where
All of the following statements concerning pregnancy are accurate $EXCEPT$
$A$ : If fertilization occurs, the corpus luteum is rescued from regression by human chorionic gonadotropin, which is produced by placenta. $R$ : In first trimester the corpus luteum stimulates by $hCG$ is responsible for the production of progesterone.
In Human beings, at the end of $12$ weeks (first trimester) of pregnancy, the following is observed
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