If it appears to be a fuzzy material or a woven fabric (usually white, but can also be gray, black, or brown), its vinyl. If it looks like suede, its probably leather. If you already own a leather/vinyl match, pay careful attention to your conditioning regimen.
The left kidney, small intestine and descending colon are all found at the lower left side of the back, also known as the left lumbar region.
In brief: Left side. The mitral valve separates the left atrium (receives blood from the lungs) from the left ventricle (main pumping chamber that pumps to the body generating the blood pressure). In brief: Left side. The mitral valve is located on the left side of the heart, between the left atrium and the left ventricle.  The mitral valve is located on the left side of the heart, between the left atrium and the left ventricle.