GENERAL KNOWLEDGE

Detailed explanation-1: -The lining of the uterus, or endometrium, prepares each month for the implantation of an embryo. This preparation occurs under the influence of estrogen and progesterone from the ovary. If no pregnancy develops, the endometrium is shed as a menstrual period, about fourteen days after ovulation.

Detailed explanation-2: -Estrogen causes the uterus to contract, allowing sperm to be transported through the female reproductive tract more efficiently after insemination.

Detailed explanation-3: -FSH is secreted during and shortly after estrus and causes a new wave of ovarian follicles to develop. A surge of LH causes the dominant ovarian follicle to rupture approximately 24 to 32 hours later, thus releasing the egg. This is ovulation and marks the transition from the follicular phase to the luteal phase.

Detailed explanation-4: -Ovulation occurs around day 14 of a typical 28-day cycle. Estrogen levels rise as a result of increased estrogen production by hormonally active granulosa cells within the follicle.