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.
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.