AP BIOLOGY

Detailed explanation-1: -The endometrium changes throughout the menstrual cycle in response to hormones. During the first part of the cycle, the hormone estrogen is made by the ovaries. Estrogen causes the lining to grow and thicken to prepare the uterus for pregnancy.

Detailed explanation-2: -One of the more common causes of changes in endometrial thickness is pregnancy. Women who are having an ectopic pregnancy or who are less than 5 weeks pregnant may show signs of a thickening endometrium.

Detailed explanation-3: -The root cause of endometrial hyperplasia is an imbalance between estrogen and progestin; the condition may mean that the lining is not fully shed each month. When there is an unusual thickening of the uterine lining, it can result in what is known as endometrial hyperplasia.

Detailed explanation-4: -Our study demonstrated that Ent in hCG administration day correlated with pregnancy outcomes in fresh IVF/ICSI cycles. The highest pregnancy rate was accompanied by 8–11 mm endometrial thicknesses and decreased to zero when Ent was > 14 mm.

Detailed explanation-5: -Sonographic Signs of Early Pregnancy The uterine cavity stays relatively straight (undistorted), which can be shown by ultrasonography. This results in the observation of the gestational sac adjacent to such a straight uterine cavity in a thick uterine lining-a sonographic sign also known as the intradecidual sign.