Identify the correct sequence of events during the menstrual cycle in female.
(A) Next cycle begins
(B) Proliferative phase
(C) Menstruation
(D) Secretory phase
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (C), (B), (D), (A)
(C) Menstruation — first. The cycle starts with the menstrual phase, when the endometrium breaks down and flows out for 3-5 days.
(B) Proliferative phase — second. This is the uterine side of the book’s follicular phase. Under the rising estrogen from the growing follicle, the endometrium regenerates by proliferation.
(D) Secretory phase — third. After ovulation, the corpus luteum secretes large amounts of progesterone during the luteal phase. The endometrium is kept thick and ready for the implantation of a fertilised ovum.
(A) Next cycle begins — last. If there is no fertilisation, the corpus luteum degenerates, the endometrium breaks down, and menstruation marks the start of a new cycle.
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