Threshold of Perception:This varies from person to person, but at a body current of 2mA everybody experiences the sensation of electric shock
Muscular Contraction: At currents from 6mA, some people cannot let go an electrified object. Others are able to break free at higher currents, but at 16mA, nobody can let go.
Difficulty in Breathing: For currents in the order of 20/30mA and above muscular contraction can spread to reach the respiratory muscles bringing about respiratory paralysis. The longer the shock duration the worse will be the effect.
To be continued