Well over 99 percent of the time, sinus tachycardia is perfectly normal. The increased heart rate doesn't harm the heart and doesn't require medical treatment. The term sinus tachycardia has nothing to do with sinuses around the nose and cheeks. Rather, it comes from the sinus node, a thumbnail-sized structure in the upper right chamber of the heart.
Complex organic food molecules such as sugars, fats, and proteins are rich sources of energy for cells because much of the energy used to form these molecules is literally stored within the chemical bonds that hold them together.
A circuit has three parts: an energy source, a connection, and a load. The energy source gives the electricity its 'push' through a circuit, for example, a battery or a generator. This push is called voltage and is similar to water pressure in a hose. The connection is a substance that is a good conductor, for example, a copper wire.