In understanding thyroid function, the nurse knows which of the following statements is true?
a. T3 is partially converted to T4 in the body.
b. T4 has a longer duration of action than T3.
c. T4 has four times the potency of T3.
d. TSH is secreted by the thyroid gland.
ANS: B
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A Incorrect: This is not true of tri-iodothyronine.
B Correct: This is true of thyroxine.
C Incorrect: Tri-iodothyronine has 4 times the potency of thyroxine.
D Incorrect: TSH is secreted by the anterior pituitary.
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