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Menstrual flow occurs due to the lack of:

  1. A
    Progesterone
  2. B
    FSH
  3. C
    Oxytocin
  4. D
    Vasopressin

Solution & Step-by-step Explanation

Toward the end of the menstrual cycle, if fertilization does not occur, the corpus luteum degenerates. This causes a sharp drop in progesterone levels, which leads to the breakdown of the endometrial lining and menstruation.

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Menstrual flow occurs due to the lack of:
A
Progesterone
B
FSH
C
Oxytocin
D
Vasopressin

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