Which of the following hormones is secreted by the thyroid gland?
Renin
Brain natriuretic peptide (BNP)
Erythropoietin
Calcitonin
The Correct Answer is D
Choice A reason: Renin, from the kidneys, regulates blood pressure via angiotensin, not a thyroid product, unrelated to its metabolic or calcium functions.
Choice B reason: BNP, secreted by the heart, reduces volume overload in heart failure, not a thyroid hormone, distinct from its endocrine role.
Choice C reason: Erythropoietin, from kidneys, stimulates red blood cell production, not produced by the thyroid, which focuses on metabolism and calcium.
Choice D reason: Calcitonin, from thyroid parafollicular cells, lowers blood calcium by inhibiting bone resorption, a key thyroid hormone alongside T3/T4.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason: Untreated hypothyroidism progresses to myxedema, a severe state with slowed metabolism causing fatigue, cold intolerance, constipation, and hair loss from low thyroid hormone.
Choice B reason: Hypocalcemia results from hypoparathyroidism, not hypothyroidism, which affects metabolism, not calcium regulation directly, so it’s unrelated to these symptoms.
Choice C reason: Pericarditis may occur in severe hypothyroidism late, but it’s not the primary complication; myxedema encompasses the broader metabolic decline seen here.
Choice D reason: Thyroid crisis (storm) is a hyperthyroid emergency with fever and tachycardia, opposite to hypothyroidism’s slow symptoms like coldness and fatigue.
Correct Answer is B
Explanation
Choice A reason: Decreased body temperature reflects hypothyroidism; levothyroxine raises metabolism, normalizing or increasing temperature, so this isn’t a therapeutic response.
Choice B reason: Increased energy occurs as levothyroxine restores thyroid hormone, boosting metabolism, reversing hypothyroidism’s fatigue, a key sign of effective treatment.
Choice C reason: Weight gain contradicts levothyroxine’s effect; it increases metabolism, aiding weight loss or stabilization, not gain, in hypothyroidism treatment.
Choice D reason: Decreased appetite isn’t typical; levothyroxine may normalize appetite as metabolism rises, not suppress it, differing from hypothyroidism’s effects.
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