Q30. The average length of a menstrual cycle is 28 days. However, it varies greatly among women (ranging from 21 to 35 days).
Q31. The young egg in the ovary begins to mature. Estrogen is secreted by the
ovary. Uterus thickens to prepare for the attachment of fertilized egg. The
mature egg is then released by the ovary.
Q32.Ovulation takes place and the egg enters the uterus. Meanwhile the
uterus continues to thicken. If no fertilization of egg occurs, the cells of
the thickened uterus break off and leave the vagina as menstruation.
Q33. After fertilization, pregnancy takes place. The egg attaches to the uterus
and continues to grow inside the womb.
Q34. It is important to study the menstrual cycle to be able to understand the natural changes that occur in the ovary and the uterus as essential part of sexual reproduction. The information is also useful in family planning to prevent unwanted pregnancy.