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.
The valve located in the left atrium is the mitral valve. As the left atrium fills with the newly oxygenated blood, the mitral valve remains closed. As the pressure changes within the left atrium and left ventricle, the mitral valve opens, allowing the oxygenated blood to flow into the left ventricle.