During hyperthyroidism:? a)a low iodine diet leads to low T3 and T4 b)Higher than normal levels of T3 and T4 positively feedback on TRH c)Higher than normal levels of T3 and T4 positively feedback on TRH and TSH d) a goiter is caused because of TSH overstimulation of the thyroid e) none of the above are correct BE ABLE TO ANSWER MORE QUESTIONS OF THIS NATURE ABOUT THE THYROID. THE QUESTIONS THAT FOLLOW ARE OVER THE MAMMARY GLANDS (PROLACTIN, PIH, AND OXYTOCIN) AND GYNECOMASTIA, SO ONLY STUDY THEM IF WE MAKE IT THAT FAR IN THE CLASS.