Texas A&M University (TAMU) NUTR 301 Nutrition Through Life Exam 1 Practice Test

A menstrual cycle is typically about four weeks long, from the first day of one period to the first day of the next. This roughly 28-day timing reflects the regular hormonal sequence that controls follicle development, mid-cycle ovulation, and the shedding of the uterine lining if pregnancy hasn’t occurred. While cycles can vary and many people have cycles that range from about 21 to 35 days, 28 days is the standard average used to describe the typical length. Shorter or longer cycles can happen, but the 28-day pattern is the most commonly cited norm.