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.
Definition: When an artist deliberately restricts the number of colors they use in a painting, they're said to be using a limited palette. (A palette being what paints are squeezed out onto, ready for use.). Also Known As: Restricted palette.
Named after the Horus Narmer, whose titulary appears on both its faces, the Narmer Palette is a flat plate of schist of about 64 centimetres in height. Its size, weight and decoration suggest that it was a ceremonial palette, rather than an actual cosmetics palette for daily use.