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(B) After ovulation,the ruptured follicle transforms into the corpus luteum under the influence of $LH$.If fertilization does not occur,the corpus lut

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Degenerates in a short time

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(B) After ovulation,the ruptured follicle transforms into the corpus luteum under the influence of $LH$.If fertilization does not occur,the corpus luteum cannot be maintained because the human chorionic gonadotropin $(hCG)$ hormone is absent.Consequently,the corpus luteum degenerates into a mass of fibrous tissue called the corpus albicans within $10-14$ days.This degeneration leads to a sharp decline in progesterone and estrogen levels,which triggers the shedding of the uterine endometrium,resulting in menstruation.

If after ovulation no pregnancy results,the corpus luteum

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