Question

A decrease in level of oestrogen and progesterone causes

• A. Loss of endometrium
• B. Growth of dilation of endometrium
• C. Release of ova from ovaries
• D. Constriction of uterine blood vessels leading to sloughing of uterine epithelium

Answer 1

The correct option is D Constriction of uterine blood vessels leading to sloughing of uterine epithelium

• Corpus luteum secretes large quantity of progesterone and small quantity of estrogen.
  
• In the absence of fertilization, the corpus luteum degenerates resulting in decreased level of progesterone and estrogen.
  
• This causes disintegration of the endometrium leading to menstruation, marking a new cycle.
  

So, the correct option is 'Constriction of uterine blood vessels leading to sloughing of uterine epithelium'.