Question at position 1 Which of these is correct about the uterine cycle?Estrogen levels are at their highest during the secretory phaseIf fertilization occurs, the corpus luteum is maintained by a hormone secreted by the embryoThe levels of progesterone increases as the follicle produces more hormone during the proliferative phaseThe menstrual phase of the uterine cycle is normally from day 1 to day 8

Question

Question at position 1 Which of these is correct about the uterine cycle?Estrogen levels are at their highest during the secretory phaseIf fertilization occurs, the corpus luteum is maintained by a hormone secreted by the embryoThe levels of progesterone increases as the follicle produces more hormone during the proliferative phaseThe menstrual phase of the uterine cycle is normally from day 1 to day 8

BlackTom AI · Accepted Answer

To tackle the question about the uterine cycle, I will evaluate each statement against the standard phases and hormonal patterns of the cycle.

Option 1: 'Estrogen levels are at their highest during the secretory phase' — This is inaccurate. Estrogen peaks mainly during the proliferative (follicular) phase to promote thickening of the endometrium, with the secretory phase being dominated by progesterone from the corpus luteum to maintain the lining after ovulation. So this option misassigns the estrogen peak to the wrong phase.

Option 2: 'If fertilization occurs, the corpus luteum is maintained by a hormone secreted by the embryo' — This is correct. After fertilization, hCG (human chorionic gonadotropin) produced by the developing embryo signals the corpus luteum to persist and continue secreting progesterone to support the endometrium until the placenta takes over later in pregnancy.

Option 3: 'The levels of progesterone increases as the follicle produces more hormone during the proliferative phase' — This statement is misleading. Progesterone is primarily produced after ovulation by the corpus luteum in the luteal phase. During the proliferative phase, estrogen drives endometrial thickening, while progesterone levels are low until the luteal phase follows ovulation.

Option 4: 'The menstrual phase of the uterine cycle is normally from day 1 to day 8' — This is not accurate for a typical cycle. The menstrual phase usually spans roughly days 1 to 5 (often cited as days 1–5), though individual variation can occur. Extending to day 8 would be longer than the normal menstrual phase.

In summary, option 2 aligns with established reproductive physiology, while options 1, 3, and 4 conflict with the standard sequence of hormonal changes and phase durations in the uterine cycle.

类似问题

Question at position 11 The female reproductive cycle is always 28 days long.TrueFalse

Which of the following can cause delayed menstruation?

Which of the following would you expect to occur if fertilisation of an oocyte did not occur?

The secretory phase of the uterine cycle is associated with:

The luteal phase is marked by high levels of FSH which stimulates the follicles to mature inside the ovary.

Question at position 10 Which of these will occur during menstruation?The corpus luteum is very activeProgesterone levels will be high The old functional layer is sloughed offThe secretory glands and blood vessels will develop in the endometriumA new uterine lining will form

If the egg is not fertilized, a period will happen?

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