Which of the following hormones is secreted by the thyroid gland?

Renin

Brain natriuretic peptide (BNP)

Erythropoietin

Calcitonin

Answer and Explanation

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.

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Correct Answer is B

Explanation

Choice A reason: Heparin prevents clotting during dialysis but doesn’t reduce hemoglobin or hematocrit directly. It’s not a primary cause of anemia in renal failure, unlike erythropoietin deficiency.

Choice B reason: Kidneys in chronic renal failure fail to produce erythropoietin, a hormone stimulating red blood cell production, leading to low hemoglobin and hematocrit, the key cause here.

Choice C reason: Minor blood loss occurs in dialysis, but it’s not the primary reason for chronic anemia. Erythropoietin deficiency from renal failure has a greater impact on counts.

Choice D reason: Poor protein intake affects overall health but isn’t the main driver of anemia in renal failure. Erythropoietin loss from kidney dysfunction is the dominant factor.

A. CT scan B. Hemoglobin and hematocrit C. MRI D. Pulmonary angiography

Correct Answer is A

Explanation

Choice A reason: CT scan rapidly detects ischemic stroke or hemorrhage in the brain, critical for numbness, headache, and speech issues, guiding urgent treatment decisions.

Choice B reason: Hemoglobin and hematocrit assess blood count, not brain pathology like stroke, which requires imaging to identify infarction or bleeding, not anemia.

Choice C reason: MRI offers detailed stroke imaging but is slower than CT, less ideal for acute ER settings needing immediate diagnosis of neurological symptoms.

Choice D reason: Pulmonary angiography evaluates lung vessels for embolism, irrelevant to stroke symptoms (numbness, headache, speech difficulty), which localize to brain issues.

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Which of the following hormones is secreted by the thyroid gland?

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Naxlex Comprehensive Predictor Exams

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Correct Answer is B

Explanation

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Correct Answer is A

Explanation

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