The substance secreted by the corpus luteum is

$A$: If fertilization occurs,the corpus luteum is rescued from regression by human chorionic gonadotropin $(hCG)$,which is produced by the placenta.
$R$: In the first trimester,the corpus luteum,stimulated by $hCG$,is responsible for the production of progesterone.

What is placenta? Give information about hormones produced by the placenta.

Pseudopregnancy is a physiological condition comparable to normal pregnancy except that there is no

Which of the following groups of hormones are produced in women only during pregnancy?

Which of the following participate in the formation of the placenta?