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.
During a stroke, the part of the brain that is affected receives insufficient oxygen and nutrients. This tissue is ischemic, meaning it receives insufficient blood flow to function normally. Ischemic tissue is injured but not dead, and the tissue injury from ischemia can be reversible.