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.
A palette is a range of colors. It is also the board that artists use to hold and mix paint. Picture Picasso in his blue period: He is holding a palette on which you see a limited palette of blue tones. Palette can refer to a range of colors. A platform used for moving things is a pallet.