Valves of the Heart. The heart functions by pumping blood both to the lungs and to the systems of the body. To prevent blood from flowing backwards or âregurgitatingâ back into the heart, a system of one-way valves are present in the heart.
An electric circuit is a path in which electrons from a voltage or current source flow. Electric current flows in a closed path called an electric circuit. The point where those electrons enter an electrical circuit is called the source of electrons.
Electron current is the flow of electrons and, since electrons have the property of negative electric charge, an electron current is necessarily a flow of charge, i.e., an electric current (in the opposite direction of the electric current).lectric charge must be carried be something. The direction of flow of positive charge is taken to be the direction of electric current. Thus, a flow of negative charge contributes to an electric current in the opposite direction.