Electricity within the human body?

It is long known that there is electricity in our bodies: electrocardiogram (ECG), electroencephalogram (EEG) and electromyogram (EMG). In 1956 the piezoelectric effect in bone was discovered by Fukada and Yasuda; a physicist and an orthopaedic surgeon in Japan. Pulsing electromagnetic fields induce electrical changes on a cellular level within the body and cell metabolism is influenced.