Involved in the mechanics of breathing; The muscles involved in this type of breathing are the diaphragm, the external intercostal muscles, and the accessory respiratory muscles (activated when respiration increases significantly) Forced Exhalation.
Nitro- a combining form (used also adjectively) designating certain compounds of nitrogen or of its acids, as nitrohydrochloric, nitrocalcite; also, designating the group or radical NO2, or its compounds, as nitrobenzene
Pure nitroglycerin is a contact explosive (physical shock may result in an explosion), which degrades over time, producing even more unstable chemical forms. As a result nitroglycerin is highly dangerous to transport or handle.