Which of the following happens during the first trimester of pregnancy?
A)Chemical messages are sent to the brain to start menstruation.
B)A woman can no longer tell if she's pregnant by using a urine test.
C)The cervix thins and begins to stretch.
D)The zygote implants itself in the lining of the uterus.

Question

Quizplus · Accepted Answer

The zygote implants itself in the lining of the uterus during the first trimester of pregnancy. Chemical messages are sent to the brain to stop, not start, menstruation when a woman becomes pregnant. A woman can still detect pregnancy using a urine test during the first trimester. The cervix thins and stretches during the last trimester of pregnancy, not the first.

Which of the Following Happens During the First Trimester of Pregnancy