Angina pectoris, commonly known as angina, is the sensation of chest pain, pressure, or squeezing, often due to ischemia of the heart muscle from obstruction or spasm of the coronary arteries.
Pure Culture. A pure culture is a population of cells or multicellular organisms growing in the absence of other species or types.
Symbolic culture. Symbolic culture is the ability to learn and transmit behavioural traditions from one generation to the next by the invention of things that exist entirely in the symbolic realm. Symbolic culture is the cultural realm constructed and inhabited uniquely by Homo sapiens and is differentiated from ordinary culture, which many other animals possess.