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.
Blood enters the heart from the superior vena cava and the inferior vena cava. It is rich in carbon dioxide. It goes from the right atrium to the right ventricle. It's then pu â¦ mped through the pulmonary arteries to the lungs.lood full of oxygen returns to the heart through the pulmonary vein. Then from the left atrium to the left ventricle. The blood, now rich in oxygen, flows through the aorta. The aorta branches into smaller arteries. The arteries carry blood all over the body.