A answered. Atrial fibrillation can be caused by a number of different things that predispose the heart to arrhythmias. Most commonly, longstanding high blood pressure is the cause. Other causes include heart disease such as blockage in the coronary vessels or diseases such as pneumonia or COPD.
A board, typically with a hole for the thumb, which an artist can hold while painting and on which colors are mixed. 2. a. The range of colors used in a visual medium, in a picture, or by an artist: a limited palette.
Word Origin and History for palette Expand. n. 1620s, flat thin tablet used by an artist to lay and mix colors, from French palette, from Old French palete small shovel, blade (13c.) diminutive of pale shovel, blade, from Latin pala spade, shoulder blade, probably from PIE *pak-slo-, from root *pag- (see pact).