Question

Magnets get attracted towards metals. The iron in the blood is also an element I.e. metal. Then why doesn't the iron in the blood get attracted towards a magnet, if we move it over our skin?

Answer 1

There is no doubt in the fact that there is iron in blood but the atoms of iron are scattered in our blood.They are present as a part of a complex ( haemoglobin) and individual iron atoms form members of haemoglobin.For a magnet to attract iron , there must be huge number of atoms of iron residing together.A negligible paramagnetic effect may be possible due to deoxygenated haemoglobin but the presence of other substances like water,oxygenated haemoglobin and plasma also lead to a diamagnetic effect.Moreover , its ferromagnetism that leads to strong attraction of iron towards a magnet.But the iron that lies inside the human body is not ferromagnetic in nature.
This is the reason because of which iron in the blood doesn't get attracted towards a magnet even if a magnet is moved over the skin.