In the electron transport chain, electrons move through the cytochromes in the following order: b566, b562, c1, c, a, and a3 (see Figure 16-19). The various cytochromes have slightly different heme groups and axial ligands, which generate different environments for the Fe ion (Figure 16-21).
On average, a woman has her period from three to seven days and the average woman menstruates from age 13 until age 51. That means the average woman endures some 456 total periods over 38 years, or roughly 2,280 days with her period -- 6.25 years of her life. Midol. You can only take up to six caplets a day, and cramps usually persist for two days. There are 40 caplets per package of Midol, which costs $8.99 at Walgreens.
1 Answer. 0. Periods happen to women from menarche, the beginning of having periods, until menopause, which is defined as no period for 1 year. So if a woman begins her periods at age 13 she could have periods until age 50 or for 37 years. Most women have a period every month or every 28 days. Some women have their period every 26 days and other women have their period at longer intervals, up to every 34 days. What is important is that the period is regular and that it starts every month around the same time and within 5 days of the last time.