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.
Narmer's Palette was not meant for actual use. Rather it is a votive, or ritual object, a gift to a god or goddess that was placed in a temple to ensure that the king or perhaâ¦ps some temple official would have access to the palette throughout eternity.