Question

1. If a patient produced very low levels of TSH, what would occur?
   1. The patient would produce high levels of TRH.
   2. The patient would produce high levels of T3 and T4.
   3. The patient would have a goiter.
   4. The thyroid would take up increased levels of iodine.

Answer 1

option B is correct

TSH = thyroid stimulating hormone

if low levels of TSH indicates hyperthyroidism.

if high levels of TSH indicates hypothyroidism.

hyperthyroidism it indicates increased levels of T3& T4

hypothyroidism indicates decreased levels of T3& T4

thyroid gland produce T3( triidothyoronin) and T4 ( thyroxine )

pituitary gland makes the hormone TSH ..it is stimulates the production of thyroid hormones and also influence the size of the thyroid gland.

enlarged thyroid gland is called goiter . it is a sign of an iodine deficiency that hasn't yet affected the function of the thyroid.

TSH levels can be the early sign of the thyroid problem. for this reason only measures TSH levels first.

A. TRH= thyrotropin releasing hormone....it is secreted by hypothalamus....it is stimulates the pituitary gland to release TSH and prolactin ..less TRH and TSH indicates more thyroid hormones levels.....if it is more TRH & TSH indicates low thyroid hormone levels.......so this option is wrong.....less TSH =less TRH.......more TRH =more TSH

B. low TSH ,,it increases the production of T3 and T4.....because less TSH doesn't not send any information to the thyroid gland that's why it increases the production of hormone levels in blood...normal TSH levels,it controls the T3 and T4 levels in blood.....if TSH not functioning properly it effects on thyroid gland hormone levels.....this option is correct....

C. pituitary gland produce more TSH to stimulate the thyroid gland ,which than causes to enlarge the gland...enlarged thyroid gland is called goiter.....goiter is caused mainly by high levels of TSH ....so this option is wrong.

D. excess iodine inhibits the thyroid hormone synthesis..it leads to increasing TSH levels ...ultimately goiter is occur. this option is also wrong.