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.
Which of the following is the least-polluting, nonrenewable energy source? A) oil B) natural gas C) biomass D) coal Wind machines use the power of _____. A) falling water B) moving air C) the earth's core D) plant and animal remains Which of the following statements is true? A) Hydropower is the most-commonly used renewable energy source in the United States. B) Hydropower uses the energy of the Sun to generate electricity. C) Natural gas is a renewable source of energy. D) Wind and water are fossil fuels. Burning biomass _____. Choose all of the answers that apply. Solar energy _____.