Cancer
Materials in which charges do not easily move are called insulators or dielectrics.
Wood An insulator is a material that does not allow charges to move through it easily.
No they do not.
Most easily?With an attracting or repelling field, a vacuum.In solids or liquids, in conductors.
EMF (voltage) is the force that keeps current flowing in a circuit.
It keeps your digestive system flowing smoothly and keeps you 'regular'.
it keeps your blood flowing
Cancer
The heart is the organ that keeps the blood flowing. Valves in the heart ensure the flow is only in one direction.
A clot
Resistance
Your heart keeps your blood "flowing"
Materials in which charges do not easily move are called insulators or dielectrics.
permanently frozen soil
it keeps blood flowing
. . . then that would be alternating current, or simply, 'AC'.