Which correctly describes renin?
A. It acts on the adrenal cortex to stimulate aldosterone secretion.
B. Its secretion is stimulated by elevated blood pressure in the renal afferent arterioles.
C. Its secretion is enhanced by high levels of Na+ in the macula densa.
D. It is secreted by juxtaglomerular cells in renal afferent arterioles.
E. It is secreted by the liver in response to low blood pressure.
Answer: D
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