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-D Art. Typical courses include drawing, illustration, sketching, painting, and collage. All are two-dimensional or 2-D forms of visual art, in which the final product is created on a flat surface. Printmaking and photography are considered 2-D arts even though the images they portray may appear to be 3-D.