After the Russian Revolution of 1917, Georgia declared independence in 1918, but the democratic Republic of Georgia, ruled by a social-democratic government, was invaded by the Red Army in 1921, a few days after it was recognized by European states.
And.. The Semilunar Valves prevent the back flow of the blood from the arteries to the ventricles. Explain what happens to tissues, such as the heart, or the brain, if oxygenated blood is not delivered in a timely manner. The tissue of the organ starts to die.
The Aorta branches off into smaller arteries throughout the body which supply blood to the bodie â¦ s cells. These vessels change over to veins which return the blood to the heart. With the exception of the Pulmonary artery which carries low oxygenated blood from the heart. 5 people found this useful.