A-LevelBiologyTransport in mammals9700/12 · Feb/Mar 2023 · Q201 Mark
The estimated total number of red blood cells in the human body is 2.5 × 10¹³. It is estimated that, each day, 2.5 × 10¹¹ red blood cells are removed from the circulation and are replaced by stem cells in the bone marrow. Which percentage of the total number of red blood cells is replaced each day?
A0.01%
B0.1%
C1%
D10%
✓ Correct answer
C: 1%
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