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.
Conductors are basically a path for electricity to flow. Electricity is made up of electrons which have a negative charge. Voltage however, is the positive force that draws electrons (current) through the conductor. Therefore, conductors will always carry negative charge in the form of current and positive charges in the form of voltage.