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Physiology

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Endocrinology

Question
33 out of 50
 

Apoptosis can occur by changes in hormone levels in the ovarian cycle. When there is no fertilization of the ovum, the endometrial cells die because:



A The involution of corpus luteum causes estradiol and progesterone levels to fall dramatically

B LH levels rise after ovulation

C Estradiol levels are not involved in the LH surge phenomenon

D Estradiol inhibits the induction of the progesterone receptor in the endometrium

Ans. A The involution of corpus luteum causes estradiol and progesterone levels to fall dramatically

a. About 2 days before the end of the monthly cycle, the corpus leatum suddenly involutes and ovarian hormones estrogen and progesterone decrease sharply to low levels of secretion.

b. .Menstruation is caused by this sudden reduction of the estrogens and progesterone, especially the progesterone, at the end of the monthly ovarian cycle.

  1. Life cycle of Corpus Luteum

a. Stage of proliferation b. Stage of Vascularization

c. Stage of Maturation d. Stage of Regression

  1. The changes in endometrium occur in the following order

a. Stage of regeneration

b. Stage of proliferation

c. Secretory phase- due to effect of progesterone on receptors that were ,induced by estrogen.

d. Menstrual phase

i. Regression of corpus lutuem with fall in level of oestrogen and progesterone is an invariable proceeding feature.

ii. As a result of withdrawal of hormone support, there is retrogressive changes in the endometrium.

Endocrinology Flashcard List

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