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.
The Narmer Palette is a 63-centimetre tall (2.07 ft) and carved from a single piece of flat, soft dark grey-green siltstone. This material was used extensively during the pre-dynastic period for make-up palettes and for creating statues in the Old Kingdom.