At the end of the uterine cycle, there is a significant drop in the levels of LH, estrogen, and progesterone. This causes all of the following EXCEPT   a. an increase in smooth muscle contractions of the uterus b. the maintenance of the corpus luteum to continue producing low levels of progesterone and estrogen c. the start of menstruation, which breaks down the blood vessels and tissues formed during the follicular stage d. a negative feedback loop to the pituitary to secrete more FSH and LH

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