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.
Best Answer: Normally. Deoxygenated blood returns to the heart from the body, and the heart returns oxygenated blood to the body through the aorta. The only place where oxygenated blood would come *to* the heart is from the lungs. Since it goes to the heart, it must be a vein. So the answer is the pulmonary veins.