Which statement is NOT true about red blood cells?
A) They are biconcave disks that lack nuclei when mature.
B) Their normal life span is about 120 days.
C) Hemoglobin is a protein that binds oxygen loosely to transport it.
D) There are about 6 million red blood cells per cubic millimeter of whole blood.
E) They are mainly produced in the liver.
Correct Answer:
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