Final answer:
Menstruation refers to the shedding of the lining of the uterus every month if fertilization has not occurred. It is accompanied by the flow of blood and may cause uterine cramps.
Step-by-step explanation:
True, Menstruation refers to the shedding of the lining of the uterus every month. It is the first phase of the uterine cycle and occurs if fertilization has not taken place during the preceding menstrual cycle. The endometrium of the uterus, which has built up during the preceding cycle, degenerates and is shed from the uterus during menstruation. The process is accompanied by the flow of blood and may be accompanied by uterine cramps.
During the menses phase, which typically lasts from 2 to 7 days, the individual may experience blood flow along with uterine cramps. The amount of blood loss averages about 35 mL. The shedding occurs because the hormone progesterone levels drop due to the degradation of the corpus luteum if no fertilization has taken place, triggering the shedding of the endometrium.