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.
1 Great for all types of surfaces including canvas, fabric, wood and ceramic. 2  Paint dish. 3  Pallet-The watercolor palette, also useful for acrylics and other water based media, is typically a rectangular or round dish with wells or indentations for mixing paint.