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 D
Explanation
Choice A reason: Working in undeveloped areas increases general infection risk, but hepatitis B specifically requires blood or fluid exposure, less likely without direct contact.
Choice B reason: Attending a conference poses low hepatitis B risk, as it’s not spread by casual contact, requiring blood or sexual transmission, not typical here.
Choice C reason: Assisting in birth involves fluid exposure, but two weeks is too short for hepatitis B symptoms; incubation is 45-180 days, so unlikely.
Choice D reason: Tattooing with unsterile needles risks hepatitis B via bloodborne transmission, matching the 90-day incubation period, the most likely risk here.
Correct Answer is D
Explanation
Choice A reason: Levothyroxine takes weeks to normalize metabolism in hypothyroidism as T4 converts to T3 gradually, so immediate symptom relief isn’t accurate or expected.
Choice B reason: Levothyroxine supplements, not decreases, thyroxine in hypothyroidism. Decreasing overproduction applies to hyperthyroidism treatments like antithyroid drugs, not this condition.
Choice C reason: Hypothyroidism requires lifelong levothyroxine since the thyroid can’t produce hormone. Stopping when symptoms resolve risks recurrence, making this advice incorrect.
Choice D reason: Excess levothyroxine mimics hyperthyroidism, causing tremors, nervousness, and insomnia from overstimulated metabolism, correctly indicating a need for dose adjustment.
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