During menstruation the level of progesterone in blood is
Low
High
Normal
Very high
What are the events that take place in the ovary and uterus during follicular phase of the menstrual cycle ?
Corpus luteum is the source of secretion of
Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Endometrium is necessary for implantation of blastocyst.
Reason $R$: In the absence of fertilization, the corpus luteum degenerates that causes disintegration of endometrium.
In the light of the above statements, choose the correct answer from the options given below:
Which one of the following events is correctly matched with the time period in a normal menstrul cycle
Menstrual flow occurs due to lack of