the study of the anatomy, normal functions, and disorders of the heart. The medical field dedicated to diagnosing and treating diseases of the heart and cardiovascular system. See Interventional cardiology, Nuclear cardiology.. APC, or atrial premature complex (or beat) is a beat that arise in the atria of the heart from outside the normal mechanism of heartbeats. It's very common and doesn't portend any bad prognosis. It increase with age, smoking, coffee intake, alcohol intake, and stress, and also with heart and lung disease.
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter. It is commonly used in nanotechnology, the building of extremely small machines. This was last updated in September 2005.
Units of measure. Nanometer (nm), an SI unit of length, equal to 10 â9 m (a billionth of a meter) Nanomolar (nM), in chemistry, one thousand-millionth of a molar; Nautical mile (NM or nmi), a unit of length used for maritime and aviation purposes; Newton metre (Nm, may also be written as NÂ·m), a unit of torque