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flight-or-fight responseFight-or-flight response, see there.
e·mer·gen·cy the·o·ry(ē-mĕr'jĕn-sē thē'ŏr-ē)
A theory of the emotions, advanced by W.B. Cannon, that animal and human organisms respond to emergency situations by increased sympathetic nervous system activity including an increased catecholamine production with associated increases in blood pressure, heart and respiratory rates, and skeletal muscle blood flow.