Question

In a regulatory cycling human female, which can be root cause of menstrual failure?

• A. Fertilization of ovum
• B. Maintenance of hypertrophical endometrial lining
• C. Maintenance of high titre of sex hormones
• D. Retention of well developed corpus luteum

Answer 1

The correct option is A Fertilization of ovum

Menstrual cycle starts with the menstrual flow (menses), this is followed by follicular phase. During this phase secretion of gonadotropins (LH and FSH) and estrogens. In the middle of the cycle, rapid secretions of LH and FSH increases leading to LH surge and hence ovulation. Ovum lasts for 24 hours only. If the sperm meets ovum within these 24 hours then it will lead to pregnancy or otherwise, it is followed by the luteal phase during which the remaining parts of Graafian follicle changes into corpus luteum.

So, the correct option is 'fertilization of ovum'.