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.
Triadic: palette based on the full range of colors around the wheel. Monochromatic: dominant use of one hue. Analogous: use of colors next to each other on the color wheel. Complementary: use of colors limited to those that are opposite each other.