During pregnancy:

1. All events of menstrual cycle stop and there is no menstruation

2. Events of menstrual cycle continue but there is no menstruation

3. Events of menstrual cycle contInue but there is menstruation only in the first trimester

4. All events of menstrual cycle stop and there is menstruation only in the first trimester

In the absence of fertilization, corpus luteum:

Which of the following is secreted only during the luteal phase of a menstrual cycle ?

1. LH

2. FSH

3. Estrogen

4. Progesterone

Graafian follicle of ovary secretes which hormone

1. Cortisone

2. Relaxin

3. Progesterone

4. None of these

Menstruation is triggered by an abrupt decline in the amount of:

1. Estrogen

2. Progesterone

3. LH

4. FSH