Large U.S. corporations also play a major role on the global stage, with more than a fifth of companies on the Fortune Global 500 coming from the United States. Even though the services sector is the main engine of the economy, the U.S. also has an important manufacturing base, which represents roughly 15% of output.
A: Lidocaine is an anesthetic or numbing agent when used topically or injected in the spinal column, and it is an antiarrhythmic (helps with irregular heart beats) when given intravenously. When it is used topically on the skin, it works by inhibiting the nerve impulses that pass along pain signals to the brain.
Dental injections deliver local anesthetics that numb part of the mouth. Doctors use local and regional anesthetics to block pain in a part of the body. Local anesthetics affect a small part of the body, such as a single tooth. Regional anesthetics affect larger areas, such as everything below the waist.