Each biological cell can be seen as a miniature battery or a miniature magnetic pole. After accurately measuring the magnetic activity of the human body, it is believed that the sources of biological magnetism may be: (1) the magnetic field produced by the movement of biological charge, (2) the induction field produced by biomagnetic materials, that is, some substances in living tissues have certain magnetism, the induced magnetic field produced by them under the action of geomagnetic field or external magnetic field, and (3) the magnetic field produced by strong magnetic materials in living organisms.
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There is a magnetic substance in the organism, which produces a magnetic field under the action of the external magnetic field