The correct answer is: C. 10 million
The bone marrow is a soft tissue found inside the bones. It is responsible for producing red blood cells, white blood cells, and platelets. Red blood cells are responsible for carrying oxygen to the body’s tissues. White blood cells are responsible for fighting infection. Platelets are responsible for clotting blood.
The bone marrow produces about 10 million red blood cells every second. This is enough to replace all of the red blood cells in the body every 4 months.
The other options are incorrect because they do not represent the number of red blood cells that the bone marrow produces every second.
Option A: 5 million red blood cells per second is too low. The bone marrow produces about 10 million red blood cells per second.
Option B: 7 million red blood cells per second is too high. The bone marrow produces about 10 million red blood cells per second.
Option D: 12 million red blood cells per second is too high. The bone marrow produces about 10 million red blood cells per second.