Florence, OR Weather Data. 1  Florence, OR Current Weather Data. 2  Sponsored. 3  Florence, OR Historical Weather Trends.  Florence, OR area 1  Highlights. Florence, OR Chance of Sunshine.  Florence, OR Historical 1  Temperature. Florence, OR Rainfall and Snowfall Average.  Florence, OR Energy Demand.
Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium. Left Side. Oxygen-rich blood returns from the lungs to your heart's left atrium through the pulmonary veins.he mitral valve does this between the left atrium and ventricle. The lub is the sound of the tricuspid and mitral valves closing. Each of your heart's ventricles has an outlet valve. The right ventricle uses the pulmonary valve to help move blood into the pulmonary arteries.
1 The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle through the mitral valve. 2  The left ventricle pumps the oxygen-rich blood through the aortic valve out to the rest of the body. The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle through the mitral valve. 2  The left ventricle pumps the oxygen-rich blood through the aortic valve out to the rest of the body.