Question 1
When the oxygen level in the blood is low, which of the following secretes erythropoietin, causing an increase in red blood cell production?
◦ lungs
◦ kidneys
◦ liver
◦ spleen
◦ pancreas
Question 2
Where does most of the cleanup of dead red blood cells take place?
◦ in the spleen
◦ in the liver
◦ in the kidneys
◦ in the bone marrow
◦ in the lungs