The extra structure that provides nutrition to the embryo is
Umbilicus
Amnion
Chorion
Placenta
Match the columns
Column $I$ | Column $II$ |
$(a)$ Third week | $(1)$ Development of pre umbilical code |
$(b)$ Third month | $(2)$ Body develops but head remains big |
$(c)$ Fourth week | $(3)$ Embryonic slit widens |
$(d)$ Fourth month | $(4)$ Muscles activate |
$A$ : 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.
During the course of development, cells in various regions of embryo become variable in morphology and eventually perform diverse functions. This process is known as
Foetus is nourished by
Which of the following secretes the hormone relaxin during the later phase of pregnancy?