Where are new blood cells created?
Great, you answered "Bone marrow".
See here what other people have answered:
- Bone marrow
- Lymph nodes
- Thyroid
- Spleen
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Interesting fact:
An average human has about 24.9 trillion small red blood cells, around 1.4 trillion platelets. Fat and muscle cells don’t even show up on that scale, yet combined, they are responsible for more than half of your weight. By the way the combined weight of all the bacteria in your body adds around 4 pounds to your weight. Red blood cells outnumber all other cells in your body by a ratio of 8:1.