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 correct choice is palette. It can also refer to the board an artist uses to mix paints or the range of tone in music: A dark chocolate in the shape of an artist's palette, with a relief of paint brushes and paints, is filled with a liquor-flavored butter cream.