The juxtaglomerular apparatus
a. secretes renin in response to sodium depletion or plasma volume reduction.
b. is a thickened region of specialized cells at a point where the distal tubule comes into intimate contact with the afferent and efferent arterioles of the same nephron.
c. is where reabsorption of sodium occurs.
d. both (a) and (b) above.
e. all of these answers.
D
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