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.
Glossary of Art Terms, K-5. A style of art that is not realistic. Unusual lines, colors, and shapes make the subject look unrealistic. It is often characterized by the use of geometric lines and shapes and bold, bright colors.