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.
On the left side, oxygen-rich blood from the lungs goes into the left atrium. When it is full, the atrium contracts, a valve opens, and the blood is sent into the left ventricle. Another valve allows the blood to flow into the aorta, the largest artery in the body. From there, the blood goes to all parts of your body.