Which of these factors stimulates the juxtaglomerular apparatus to produce renin?
A. sudden decreases in blood pressure
B. concentration of sodium ions in the blood is too low
C. concentration of potassium ions in the blood is too high
D. both sudden decreases in blood pressure and concentration of sodium ions in the blood is too low.
E. All of these conditions increase renin secretion.
Answer: D. both sudden decreases in blood pressure and concentration of sodium ions in the blood is too low.
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