What releases erythropoietin when blood flow or oxygenation to the nephron is decreased?
A) The countercurrent mechanism
B) The nephron
C) The juxtaglomerular cells
D) The glomerulus
C
Feedback:
Whenever blood flow or oxygenation to the nephron is decreased (due to hemorrhage, shock, heart failure, or hypotension), the hormone erythropoietin is also released from the juxtaglomerular cells. Therefore, options A, B, and D are not correct.
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