Pharmaceutical Quiz 132

By Anonymous -



The thyroid gland is a vitally important endocrine (hormone) gland that is mainly involved in the body’s energy metabolism. It is located at the front of the neck, below the voice box, and is butterfly-shaped. The thyroid gland produces the thyroid hormones triiodothyronine (T3) and thyroxine (T4), among other things.

These thyroid hormones have various functions: They are responsible for the metabolism, growth and development of the body. The production of the thyroid hormones is regulated by the pituitary gland. The pituitary gland makes a hormone called TSH (thyroid-stimulating hormone). TSH not only stimulates the production of thyroid hormones – it also influences the size of the thyroid gland.

The thyroid gland constantly releases a certain amount of hormones into the blood. So a blood test can be used to determine the amounts of hormones produced by the thyroid gland. The blood test measures the levels of TSH and the thyroid hormones triiodothyronine (T3) and thyroxine (T4). A change in the TSH level can be an early sign of a thyroid problem. For this reason, it is common to only measure the TSH level at first.

If the TSH level in the blood is higher or lower than normal, the levels of the thyroid hormones T4 and T3 are also measured.

High TSH levels are a sign of an underactive thyroid (hypothyroidism). The pituitary gland produces more TSH in order to stimulate the thyroid gland to produce thyroid hormones. Very low TSH levels in the blood may be a sign of an overactive thyroid (hyperthyroidism). The pituitary gland then produces less TSH, in order to stop “telling” the thyroid gland to make more hormones.

According to the American Thyroid Association TSH levels typically fall between 0.4 and 4.0 milliunits per liter (mU/L).

The correct answer is B.
-Source https://www.ncbi.nlm.nih.gov/books/NBK279414/
-Pharmwar © Created by Silvi Hoxha - Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)

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