Dear Umar Haruna و

The skin is fatty and therefore it behaves as a very band conductor even it is much like leaky insulator. So, as the colleague Aparna Sathya Murthy said the skin is equivalent to a parallel combination of resistor and a capacitor.

But when you measure it you must coat the skin with a conducting gel to avoid the interface resistance between the electrodes and the skin.

Best wishes

The sensors are usually design as having very high impedance so reducing the impact of skin-electrode impedance to minimum.

I thank you all for your time and wonderful response. I am really grateful.