NM706 Module 6 questions with correct answers

Normal Hypothalamus Function Answer Normally the hypothalamus secretes thyrotopin-releasing hormone (TRH) which stimulates the anterior pituitary to release thyroid-stimulating hormone (TSH). -TSH in turn stimulates the thyroid gland to release thyroid hormone (T4 and T3). -When thyroid levels reach a predetermined blood level, they stop the release of TSH, temporarily stopping the cascade. Thyroid Size In Pregnancy Answer -Normal physiologic changes that occur to the thyroid and thyroid hormones during pregnancy is that it physically enlarges up to 30% of its normal size by the third trimester. -This normal physiologic change in size does not require a workup as long as the woman remains symptom free. -The thyroid can enlarge up to 30% by the third trimester, doesn't happen all at one time-gradual. Neck area looks fuller. When does Fetus Start Developing Thyroid Hormones Answer While it is true that the fetal thyroid gland begins to synthesize thyroid hormone around 12 weeks' gestation, transfer of maternal T4 to the fetus is important for normal fetal brain development throughout pregnancy. How does Placental hCG effect Thyroid Levels Answer -Placental hCG levels decrease the release of thyroid stimulating hormone (TSH) throughout pregnancy