Aluminum Grades Series 7xxx. Zinc, in amounts of 1 to 8% is the major alloying element in 7xxx series aluminum alloys (7075, 7050, 7049, 710.0; 711.0 etc.), and when coupled with a smaller percentage of magnesium results in heat-treatable alloys of moderate to very high strength.
We previously learned that arteries carry blood away from the heart and that veins carry blood toward the heart. This idea holds true here because we see that the pulmonary arteries are carrying blood away from the heart and the pulmonary veins are carrying blood to the heart. The interesting thing is that in most areas of the body, veins carry blood that is low in oxygen and arteries usually carry blood that's rich in oxygen.
This can happen when plaque deposits in the blood vessel walls rupture and a blood clot forms. If a piece of the blood clot breaks away and gets into the bloodstream, it can block the flow of blood to the heart or brain and cause a heart attack or stroke. A blood clot in an artery is called an arterial thrombosis.A blood clot in the vein is called a venous thrombosis. blood clot is a jelly-like mass of blood tissue formed by clotting (coagulating) factors in the blood. A blood clot is a normal reaction of the body that occurs if a blood vessel is injured. This is desirable if it occurs to stop the bleeding caused by an injury.