Multiple Choice
What is erythropoietin (EPO) and how is it secreted?
A) It is secreted by the kidneys in response to low oxygen levels.
B) It is secreted by the liver in response to low hemoglobin levels.
C) It is secreted by bone marrow in response to decreasing numbers of red blood cells.
D) It is secreted by the spleen in response to an increased number of damaged red blood cells.
Correct Answer:

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Correct Answer:
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