Tiffany, a 25-year-old woman stated that it had been six weeks since her last me
ID: 98263 • Letter: T
Question
Tiffany, 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. What hormonal component is the basis of pregnancy tests? Following the positive pregnancy test, what hormonal mechanism prevented spontaneous abortion of the implanted embryo? What prevented the uterus from initiating labor before the designated delivery time? Describe the positive feedback systems that occur during labor and delivery. What maintains milk production after birth? Is it possible to get pregnant during the time of breast feeding? Explain your answer.Explanation / Answer
1) The trophoblastic cells of the developing embryo produces human chorionic gonadotrophic (HCG) hormone. This hormone forms the basis of pregnancy tests.
2) The hormone progesterone prevents the spontaneous abortion of implanted embryo.
3) The levels of hormone progesterone will remain high till the time of child birth. It prevents the uterus from initiating labor before delivery time.
4) At the time of child birth, the autorhythmic contractions in uterus starts the stimulation which causes cervical dilatation. This in turn stimulates posterior pituitary to secrete oxytocin. This results in increased plasma oxytocin and increased uterine contractions.
5) The milk production after child birth is stimulated by suckling of baby. The hormones responsible are prolactin and oxytocin. Prolactin is responsible for milk production and oxytocin is responsible for ejection of milk.
6) The possibility of getting pregnancy during breastfeeding is minimal. The gonadotrophin releasing hormone (GnRH) is inhibited by lactase. Further uterus is not in a position for the implantation of fertilised ovum.