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.
Electric Current The flow of electric charge. Any complete path through which electricity travels. Closed Circuit. A circuit in which there is a complete path for. electricity to flow. Open Circuit A circuit in which there is a break so current cannot. flow. Conductors A material that easily carries electrical current. Insulators A material that poorly conducts electrical current or. heat.