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.
Since arteries supply oxygen and blood to the tissues, any occlusion will lead to oxygen deprivation. This is what is seen in a heart attack or a stroke. Occlusion can occur in any vessel in the body and the symptoms will depend on what organ is affected.