Multiple choice

Regarding the menstrual cycle in females, which of the following statements is false?

  1. Deviation from the typical 28-day menstrual cycle typically occurs because of different lengths in the follicular phases.  

  2. During menstruation, thromboxane and prostaglandin homeostasis control myometrial and vascular contractions in the uterus.

  3. Prolonged elevations in progesterone levels triggers the LH surge.

  4. Although one oocyte is typically ovulated per cycle, several will begin their development.

  5. The menstrual cycle can be described by the ovarian or uterine cycle.
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C Correct answer
Explanation

Prolonged elevations in estrogen, not progesterone, triggers the LH surge. Prolonged elevations of progesterone suppress FSH and thus the next menstrual cycle (consider that pregnancy results in elevated progesterone levels, maintaining the endometrium and suppressing ovulation).

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