To fight disease in the body To carry oxygen to all parts of the body To remove carbon monoxide from all parts of the body To produce materials which cause the blood to clot.
I gave my students this multiple choice question: What is the main function of red blood cells?

Only one answer is correct among these 4 choices:
- To fight disease in the body
- To carry oxygen to all parts of the body
- To remove carbon monoxide from all parts of the body
- To produce materials which cause the blood to clot.

Could you tell me which one is correct?

To carry oxygen to all parts of the body