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.
Keep a Record. You need to count the number of days between the first day of your period and the first day of your next period. This determines your cycle length, which for most women is 28 days, but it can be anywhere between 25 and 35 days. Once you know the first and last days of your period, keep a record of it. Highlight these days on a calendar to get an idea of when your next period might come.