Vagal maneuvers are used to try to slow an episode of fast heart rate. These simple maneuvers stimulate the vagus nerve, sometimes resulting in slowed conduction of electrical impulses through the atrioventricular (AV) node of the heart. Be sure to talk to your doctor before trying these. Vagal maneuvers that you can try to slow your fast heart rate include: Gagging. Holding your breath and bearing down (Valsalva maneuver). Immersing your face in ice-cold water (diving reflex).
Some examples of renewable energy sources are solar energy, wind energy, hydropower, geothermal energy, and biomass energy. These types of energy sources are different from fossil fuels, such as coal, oil, and natural gas.
Energy resources can be divided into two categories: nonrenewable and renewable. Nonrenewable resources. A nonrenewable resource is a resource that can be used up. Fossil fuels, which include coal, oil and natural gas, are nonrenewable because it took millions of years for them to form. Once we use up our fossil fuels, they will be gone for good. Many power plants use fossil fuels.