A 25-year-old woman stated that it had been six weeks since her last menses. Her pregnancy test was positive. By the sixth month of pregnancy, she felt irregular contractions of the uterus but no complications were present. After nine months, a healthy, 7 lb., 3 oz girl was delivered with no complications. Breast feeding was planned.

A. What hormonal component is the basis of pregnancy tests?

B. What prevented the uterus from initiating labor before the designated delivery time?

C. Describe the positive feedback systems that occur during labor and delivery

D. What maintains milk production after birth?

E. Is it possible to get pregnant during the time of breast feeding? Explain your answer

Answer:

A.

human chorionic gonadotrophin ( hCG) is the hormone which is basis for pregnancy test.

Pregnancy test can be done by urine test. In this urine will be tested for presence of hCG. If present pregnancy positive

B.

Placenta is the vital part of the fetus. Other than routine nutrition, elimination, circulatory function placenta is having hormonal function.

It produces estrogen and progesterone which prevents the contractions of uterus during pregnancy, before the delivery time.

C.

There will be uterine contractions during labor with the positive feedback mechanism of oxytocin.

D.

Baby's sucking reflex acts as stimulus to the breast. Prolactin maintains the breast feeding after delivery.

E.

It's not possible to get pregnancy during breast feeding. Because there will be hormonal changes that acts as spacing method. It's called as lactational amenorrhea.