Which one of the following is the correct matching of the events occurring during the menstrual cycle?

Explanation

a) Proliferative phase:The proliferative phase is the first phase of the menstrual cycle in females. It occurs after menstruation when the uterine lining (endometrium) has been shed. During this phase, under the influence of estrogen produced by the developing ovarian follicles, the endometrium begins to thicken and regenerate. The proliferative phase is characterized by the growth and proliferation of endometrial cells and the development of blood vessels in preparation for a potential pregnancy. It typically occurs from days 6 to 14 of a 28-day menstrual cycle.b) Secretory phase:The secretory phase is the second phase of the menstrual cycle. It occurs after ovulation when an egg is released from the ovary. During this phase, the ruptured follicle in the ovary transforms into the corpus luteum, which produces progesterone. Progesterone prepares the endometrium for possible implantation of a fertilized egg. Under the influence of progesterone, the endometrial glands secrete a nutrient-rich fluid to support the developing embryo. If pregnancy does not occur, the corpus luteum will regress, progesterone levels will drop, and the secretory phase will transition into the proliferative phase again. The secretory phase typically occurs from days 15 to 28 of a 28-day menstrual cycle.c) Menstruation:Menstruation is a natural process that occurs in females during their reproductive years. It is the shedding of the uterine lining (endometrium) when a fertilized egg does not implant in the uterus. Menstruation marks the beginning of a new menstrual cycle and is characterized by the discharge of blood, mucus, and tissue from the vagina. It typically lasts for 3 to 7 days but can vary from woman to woman. The shedding of the endometrium is driven by a decrease in estrogen and progesterone levels when there is no pregnancy.d) Ovulation:Ovulation is a critical event in the menstrual cycle. It is the release of a mature egg (ovum) from the ovary into the fallopian tube, where it can potentially be fertilized by sperm. Ovulation typically occurs around the midpoint of a woman's menstrual cycle, approximately 14 days before the start of the next menstrual period. Ovulation is triggered by a surge in luteinizing hormone (LH) from the pituitary gland, which stimulates the release of the egg from the dominant ovarian follicle. The released egg is then available for fertilization for about 24 hours. If fertilization does not occur, the egg will be absorbed by the body, and the menstrual cycle will continue with the shedding of the uterine lining during menstruation.