Neco Model Questions Vol1 2017 Biology Question 49

The length of the follicular phase (\(L_f\)) of a woman's menstrual cycle (in days) is inversely related to the average concentration of follicle‑stimulating hormone (FSH) during that phase, according to the relation \( L_f = \frac{120}{[FSH]} \), where \([FSH]\) is expressed in mIU mL\(^{-1}\). The luteal phase is constant at 14 days. (a) If a woman's average FSH concentration is 10 mIU mL\(^{-1}\), calculate the length of her follicular phase and the day of ovulation (the day when the follicular phase ends). (b) If she starts a contraceptive regimen that lowers her average FSH concentration to 8 mIU mL\(^{-1}\), what will be the new length of the follicular phase and the new day of ovulation? Provide your answers in days.