Question

Arrange the order in which hormones begin to increase in level, from day one of the menstrual cycle:

1) FSH
2) LH
3) Progesterone
4) Estrogen

a. 1, 4, 2, 3
b. 4, 3, 2, 1
c. 2, 1, 3, 4
d. 1, 2, 3, 4
e. 3, 2, 1, 4

Answer 1

The correct sequence of hormonal increases from the first day of the menstrual cycle is FSH, then Estrogen, followed by LH, and finally Progesterone, represented by sequence a) 1, 4, 2, 3.

Step-by-step explanation:

When considering the menstrual cycle and the hormonal changes therein, we can arrange the order in which hormones begin to increase from day one of the menstrual cycle as follows: FSH (Follicle Stimulating Hormone), Estrogen, LH (Luteinizing Hormone), and Progesterone. Therefore, the correct sequence is option a) 1, 4, 2, 3.

At the start of the menstrual cycle, FSH levels rise to stimulate the growth of ovarian follicles. Each follicle contains an egg and as they begin to mature, they release Estrogen. The rising estrogen levels then lead to a surge in LH, which is instrumental in triggering ovulation around day 14 of the cycle. Finally, following ovulation, the corpus luteum forms and secretes Progesterone, thickening the endometrium in preparation for potential pregnancy.

If pregnancy does not occur, progesterone and estrogen levels will fall, leading to menstruation, and the cycle begins anew with the rise once again of FSH.