One complete heart beat, during which both atria and ventricles contract and relax, is termed _____ and is marked by a succession of changes in _____ and _____. within the heart the cardiac cycle, blood volume, pressure
Pan vs. Epi(demic) Good to know: An âepidemicâ is simply a proliferation of an infectious disease beyond that normally observed. A âpandemicâ is an epidemic that spreads across regions or continents. The number of dead is not part of the definition. Indeed, a pandemic may kill no one at all. October 27, 2009
A pân junction. The circuit symbol is shown: the triangle corresponds to the p side. See also: pân diode and Diode Â§ Semiconductor diodes. A pân junction is a boundary or interface between two types of semiconductor material, p-type and n-type, inside a single crystal of semiconductor.he same is true of an n-doped semiconductor, but the junction between them can become depleted of charge carriers, and hence non-conductive, depending on the relative voltages of the two semiconductor regions.