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.
2. the set of colors on such a board. 3. the range of colors used by a particular artist. 4. the variety of techniques or range of any art: a composer's musical palette. 5. the complete range of colors made available by a computer graphics card, from which a user or program may choose those to be displayed.