During the menstrual cycle, what typically occurs when estrogen and progesterone levels drop at the end of the cycle?
Menstruation starts
Toward the end of the menstrual cycle, in the absence of pregnancy, the corpus luteum regresses, so estrogen and progesterone levels fall.
Without hormonal support, the thickened endometrium cannot be maintained; its spiral arteries constrict and it is shed as menstrual flow.
A thickened uterine lining and a maturing follicle belong to the earlier phases, and ovulation occurs mid-cycle at the estrogen peak — none follow the end-of-cycle hormone drop.
Hence, Menstruation starts.
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Important Questions from Physiology
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What is the primary function of the baroreceptors located in the carotid sinus and aortic arch?
Which of the following organs play(s) the primary role in maintaining fluid and electrolyte balance in the human body?
What is the primary function of alveoli in the lungs?
A patient presents with excessive thirst, frequent urination, and fatigue. Laboratory results reveal low levels of antidiuretic hormone. Which endocrine gland is most likely malfunctioning in this scenario?
