Asker's rating. 1  Fred is correct the smaller the number the bigger the metal. 2  12 gauge is thinner than 7 gauge. 3  The gague refers to the thickness of the metal in question. the issue of strenght is really determines by the type of metal, not necessarily it's thickness.
The left ventricle pumps oxygen-rich blood out of the heart and into an artery called the aorta. From the aorta, blood branches out into a series of ever smaller tube-like vessels: arteries, arterioles and finally capillaries. The capillaries deliver the blood's oxygen and nutrients to cells.
left side of the heart the pulmonary vein empties oxygen rich blood from the lungs into the left atrium of the heart as the atrium contracts blood flows from your left atrium into your left ventricle through the open mitral valve when the ventricle is full the mitral valve shuts this prevents blood from flowing backward into the atrium while the ventricle contracts