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 heart then sends the blood out to the body cells, after which the blood once again returns to the heart. Oxygen Delivery Because blood from the heart travels to the lungs before being sent out to the body, the blood going to your body cells is rich in oxygen.