Identify the correct sequence of events during menstrual cycle in human.
(A) Next cycle begins
(B) Secretory phase
(C) Follicular phase
(D) Menstruation
Choose the correct answer from the options given below.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (D), (C), (B), (A)
(D) Menstruation — first. The cycle starts with the menstrual phase, when the menstrual flow lasts for 3-5 days. The flow comes from the breakdown of the endometrial lining of the uterus and its blood vessels.
(C) Follicular phase — second. Under the action of FSH and LH, the primary follicles grow into a mature Graafian follicle. The endometrium also rebuilds itself. This phase ends with ovulation in the middle of the cycle.
(B) Secretory phase — third. This is the luteal phase, which follows ovulation. The remains of the Graafian follicle form the corpus luteum, which secretes progesterone. Progesterone keeps the endometrium ready for implantation.
(A) Next cycle begins — last. If fertilisation does not take place, the corpus luteum degenerates. The endometrium then breaks down, and menstruation starts a new cycle.
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