[Solved] In aortic dissection, inward displacement of a calcified atherosclerotic plaque more than 1 cm from the outer vessel wall in the descending aorta is known as the _________ sign. A) calcification B) thumbnail C) fleck D) migration Stimulant: A substance that raises levels of physiological or nervous activity in the body, often used to increase alertness, attention, and energy. Sleep: A naturally recurring state of mind and body, characterized by altered consciousness, relatively inhibited sensory activity, reduced muscle activity, and inhibition of nearly all voluntary muscles during rapid eye movement (REM) sleep phases. Aging: The process of becoming older, which includes biological, emotional, intellectual, and social changes. Hypothalamus: A region of the brain that regulates basic biological needs and motivational systems such as hunger, thirst, and body temperature.