A 60-year-old hypertensive man is diagnosed with stenosis of a major renal artery. To compensate for decreased blood perfusion of the affected kidney, he produces an excess of the compound labeled X in the figure below. Which of the following best characterizes compound X? A) It causes arteriolar vasoconstriction. B) It is produced by juxtaglomerular cells of the kidney. C) It is secreted in response to infusions rich in Na⁺. D) It is under tight control of adrenocorticotropic hormone (ACT H). E) It promotes sodium retention and potassium excretion in the distal tubules of nephrons.

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The Answer of A 60-year-old hypertensive man is diagnosed with stenosis of a major renal artery. To compensate for decreased blood perfusion of the affected kidney, he produces an excess of the compound labeled X in the figure below. Which of the following best characterizes compound X? A) It causes arteriolar vasoconstriction. B) It is produced by juxtaglomerular cells of the kidney. C) It is secreted in response to infusions rich in Na⁺. D) It is under tight control of adrenocorticotropic hormone (ACT H). E) It promotes sodium retention and potassium excretion in the distal tubules of nephrons.

A 60-Year-Old Hypertensive Man Is Diagnosed with Stenosis of a Major