system
Given the following post, respond as if you're commenting on Reddit:
human
Considering the fact that Iron exists in blood, does the blood flow get affected around powerful magnets?

Like MRI scanners, etc? Posing the question differently what is the minimum magnetic intensity required to change the direction of an RBC in a hypothetical situation?
gpt
Iron in blood is not ferromagnetic. 

hemoglobin has magnetic properties that change based on its oxygen bound/unbound state. That is the principle behind observing activation areas in the brain using MRI.